# Orders of magnitude (length)

(Redirected from 1 E+25 m)

The following are examples of orders of magnitude for different lengths.

## Overview

Section Range (m) Unit Example Items
<
Planck length 10−35 P Quantum foam
Subatomic 10−35 10−15 am Electron, quark, string
Atomic and cellular 10−15 10−12 fm Atomic nucleus, proton, neutron
10−12 10−9 pm Wavelength of gamma rays and X-rays, hydrogen atom
10−9 10−6 nm DNA helix, virus, wavelength of optical spectrum
Human scale 10−6 10−3 μm Bacterium, fog water droplet, human hair's diameter[1]
10−3 100 mm Mosquito, golf ball, domestic cat, violin, football
100 103 m Cello, human, automobile, sperm whale, football field, Eiffel Tower
103 106 km Walt Disney World, Mount Everest, length of Panama Canal and Trans-Siberian Railway, larger asteroid
Astronomical 106 109 Mm The Moon, Earth, one light-second
109 1012 Gm Sun, one light-minute, Earth's orbit
1012 1015 Tm Orbits of outer planets, Solar System
1015 1018 Pm One light-year; distance to Proxima Centauri
1018 1021 Em Galactic arm
1021 1024 Zm Milky Way, distance to Andromeda Galaxy
1024 Ym Huge-LQG, Hercules-Corona Borealis Great Wall, visible universe

## Detailed list

To help compare different orders of magnitude, the following list describes various lengths between 1.6×10−35 meters and ${\displaystyle 10^{10^{10^{122}}}}$meters.

### Subatomic

Factor (m) Multiple Value Item
10−35 1 Planck Length 0.0000000000162 ym (1.62×10−35 m) Planck length; typical scale of hypothetical loop quantum gravity or size of a hypothetical string and of branes; according to string theory lengths smaller than this do not make any physical sense.[2] Quantum foam is thought to exist at this level.
10−24 1 yoctometer (ym) 20 ym (2 × 10−23 meters) Effective cross section radius of 1 MeV neutrinos[3]
10−21 1 zeptometer (zm) Preons, hypothetical particles proposed as subcomponents of quarks and leptons; the upper bound for the width of a cosmic string in string theory.
7 zm (7 × 10−21 meters) Effective cross section radius of high energy neutrinos[4]
310 zm (3.10 × 10−19 meters) De Broglie wavelength of protons at the Large Hadron Collider (4 TeV as of 2012)
10−18 1 attometer (am) Upper limit for the size of quarks and electrons
Sensitivity of the LIGO detector for gravitational waves[5]
Upper bound of the typical size range for "fundamental strings"[2]
10−17 10 am Range of the weak force
10−16 100 am 850 am approximate proton radius[6]

### Atomic to cellular

Factor (m) Multiple Value Item

10−15 1 femtometer (fm) 1.5 fm Size of an 11 MeV proton[7]
Scale of the atomic nucleus[2][9]
10−12 1 picometer (pm) ... Longest wavelength of gamma rays
1 pm Distance between atomic nuclei in a white dwarf
2.4 pm Compton wavelength of electron
5 pm Wavelength of shortest X-rays
10−11 10 pm 25 pm Radius of hydrogen atom
31 pm Radius of helium atom
10−10 100 pm 100 pm (0.1 nm) 1 Ångström (also covalent radius of sulfur atom[10])
154 pm (0.154 nm) Length of a typical covalent bond (C–C).
500 pm (0.50 nm) Width of protein α helix

10−9 1 nanometer (nm) 1 nm Diameter of a carbon nanotube[11]
2 nm Diameter of the DNA helix[12]
2.5 nm Smallest microprocessor transistor gate oxide thickness (as of Jan 2007)
3.4 nm Length of a DNA turn (10 bp)[13]
6–10 nm Thickness of cell membrane
10−8 10 nm 10 nm Thickness of cell wall in Gram-negative bacteria[citation needed]
14 nm As of 2015, the 14 nanometer was the smallest semiconductor device fabrication node
40 nm Extreme ultraviolet wavelength
50 nm Flying height of the head of a hard disk.[14]
10−7 100 nm 121.6 nm Wavelength of the Lyman-alpha line[15]
120 nm Typical diameter of the human immunodeficiency virus (HIV)[16]
400–700 nm Approximate wavelength range of visible light[17]

### Human scale

Factor (m) Multiple Value Item

10−6 1 micrometer (μm)

(also called one micron)

1–4 μm Typical length of a bacterium.[18]
4 μm Typical diameter of spider silk.[19]
7 μm Typical size of a red blood cell.[20]
10−5 10 μm 10 μm Typical size of a fog, mist or cloud water droplet. Chip 10 μm process in 1971.
12 μm Width of acrylic fibre
25.4 μm 1/1000 inch, commonly referred to as one thou or one mil
10−4 100 μm 100 μm Average width of a strand of human hair[1]
200 μm Typical length of Paramecium caudatum, a ciliate protist
750 μm Maximum diameter of Thiomargarita namibiensis, the largest bacterium ever discovered
10−3 1 millimeter (mm) 2.54 mm 1/10th inch; distance between pins in DIP (dual-inline-package) electronic components
5 mm Length of average red ant
7.62 mm Common military ammunition size
10−2 1 centimeter (cm) 1.5 cm Length of a large mosquito
2.54 cm 1 inch
4.267 cm Diameter of a golf ball
10−1 1 decimeter (dm) 10 cm Wavelength of the highest UHF radio frequency, 3 GHz
30.48 cm 1 foot
91.44 cm 1 yard

100 1 meter 1 m Wavelength of the lowest UHF and highest VHF radio frequency, 300 MHz
1.7 m (5 feet 7 inches) Average height of a human
8.38 m The length of a London Bus (Routemaster)
101 1 decameter (dam) 10 m Wavelength of the lowest VHF and highest shortwave radio frequency, 30 MHz
33 m Length of longest blue whale measured, the largest animal[21]
93.47 m Height of the Statue of Liberty (foundation of pedestal to torch)
102 1 hectometer (hm) 100 m Wavelength of the lowest shortwave radio frequency and highest medium wave radio frequency, 3 MHz
137 m (147 m) Height (present and original) of the Great Pyramid of Giza
828 m Height of the Burj Khalifa, the world's tallest man-made building.
979 m Height of the Salto Angel, the world's highest free-falling waterfall (Venezuela)
103 1 kilometer (km) 1 km Wavelength of the lowest medium wave radio frequency, 300 kHz
1609 m 1 statute mile
1852 m 1 nautical mile
8848 m Height of the highest mountain on Earth, Mount Everest
104 10 km 10.911 km Depth of deepest part of the ocean, Mariana Trench
13 km Narrowest width of the Strait of Gibraltar, separating Europe and Africa
90 km Width of the Bering Strait
105 100 km 111 km Distance covered by one degree of latitude on Earth's surface
163 km Length of the Suez Canal
974.6 km Greatest diameter[22] of the dwarf planet[note 1] Ceres

### Astronomical

Factor (m) Multiple Value Item

106 1,000 km = 1 megameter (Mm) 2,390 km Diameter of dwarf planet Pluto, formerly the smallest planet category[note 1] in the Solar System
3,480 km Diameter of the Moon
5,200 km Typical distance covered by the winner of the 24 Hours of Le Mans automobile endurance race
6,400 km Length of the Great Wall of China
6,600 km Approximate length of the two longest rivers, the Nile and the Amazon
7,821 km Length of the Trans-Canada Highway
9,288 km Length of the Trans-Siberian Railway, longest in the world

107 10,000 km 12,756 km Equatorial diameter of Earth
40,075 km Length of Earth's equator

108 100,000 km 142,984 km Diameter of Jupiter
299,792.458 km Distance traveled by light in one second
384,000 km = 384 Mm Moon's orbital distance from Earth

109 1 million km = 1 gigameter (Gm) 1,390,000 km = 1.39 Gm Diameter of the Sun
4,800,000 km = 4.8 Gm Greatest mileage ever recorded by a car (3 million miles by a 1966 Volvo P-1800S, still driving)

1010 10 million km 18 million km Approximately one light-minute

1011 100 million km 150 million km = 150 Gm 1 astronomical unit (AU); mean distance between Earth and Sun
~ 900 Gm Optical diameter of Betelgeuse (~600 × Sun)

1012 1000 million km = 1 terameter (Tm) 1.4 ×109 km Orbital distance of Saturn from Sun
1.96 ×109 km Estimated optical diameter of VY Canis Majoris (1420 × Sun)
2.3 ×109 km Estimated optical diameter of NML Cygni (1650 × Sun)
2.37 ×109 km Median point of the optical diameter of UY Scuti, as of 2014 the largest known star
5.9 ×109 km = 5.9 Tm Orbital distance of Pluto from Sun
~ 7.5 ×109 km = 7.5 Tm Outer boundary of the Kuiper belt, inner boundary of the Oort cloud (~ 50 AU)

1013 10 Tm Diameter of the Solar System as a whole[2]
16.25×109 km = 16.25 Tm Distance of the Voyager 1 spacecraft from Sun (as of Feb 2009), the farthest man-made object so far[23]
62.03×109 km = 62.03 Tm Estimated radius of the event horizon of the supermassive black hole in NGC 4889, the largest known black hole to date

1014 100 Tm 1.8×1011 km = 180 Tm Size of the debris disk around the star 51 Pegasi [24]
2×1011 km = 200 Tm Total length of DNA molecules in all cells of an adult human body [25]
1015 1 petameter (Pm) ~ 7.5 ×1012 km = 7.5 Pm Supposed outer boundary of the Oort cloud (~ 50,000 AU)
9.46×1012 km = 9.46 Pm
= 1 light year
Distance traveled by light in one year; at its current speed, Voyager 1 would need 17,500 years to travel this distance

1016 10 Pm 3.2616 light-years
(3.0857×1013 km = 30.857 Pm)
1 parsec
4.22 light-years = 39.9 Pm Distance to nearest star (Proxima Centauri)
4.37 light-years = 41.3 Pm As of March 2013, distance to nearest discovered extrasolar planet (Alpha Centauri Bc)

1017 100 Pm 20.4 light-years = 193 Pm As of October 2010, distance to nearest discovered extrasolar planet with potential to support life as we know it (Gliese 581 d)
65 light-years = 6.15×1017 m = 615 Pm Approximate radius of humanity's radio bubble, caused by high-power TV broadcasts leaking through the atmosphere into outer space

1018 1 exameter (Em) 200 light-years = 1.9 Em Distance to nearby solar twin (HIP 56948), a star with properties virtually identical to our Sun [26]

1019 10 Em 1,000 light-years = 9.46 Em or 9.46 × 1015 km Average thickness of Milky Way Galaxy[27] (1000 to 3000 ly by 21 cm observations[28])

1020 100 Em 12,000 light-years = 113.5 Em or 1.135 × 1017 km Thickness of Milky Way Galaxy's gaseous disk[29]
950 Em 100,000 light-years Diameter of galactic disk of Milky Way Galaxy[2]

1021 1 zettameter (Zm)
50 kiloparsecs Distance to SN 1987A, the most recent naked eye supernova
52 kiloparsecs = 1.62×1021 m = 1.62 Zm Distance to the Large Magellanic Cloud (a dwarf galaxy orbiting the Milky Way)
54 kiloparsecs = 1.66 Zm Distance to the Small Magellanic Cloud (another dwarf galaxy orbiting the Milky Way)
200 kiloparsecs = 6.15 Zm Diameter of the low surface brightness disc halo of the giant spiral galaxy Malin 1

1022 10 Zm 13.25 Zm = 1.4 million light years
= 600 kiloparsecs
Radius of the diffuse stellar halo of IC 1101, one of the largest known galaxies
24 Zm = 2.5 million light-years
= 770 kiloparsecs
Distance to Andromeda Galaxy
3.26 million light-years
=30.8 Zm = 1 megaparsec
1 megaparsec
50 Zm (1.6 Mpc) Diameter of Local Group of galaxies

1023 100 Zm 300–600 Zm = 10–20 megaparsecs Distance to Virgo cluster of galaxies

1024 1 yottameter (Ym) 200 million light-years
= 1.9 Ym = 61 megaparsecs
Diameter of the Local Supercluster and the largest voids and filaments.
300 million light-years
= 2.8 Ym = 100 megaparsecs
End of Greatness
550 million light-years
~170 megaparsecs ~5 Ym
Diameter of the enormous Horologium Supercluster [30]

1 billion light-years
= 9.46 Ym =306 megaparsecs
Diameter of the Pisces–Cetus Supercluster Complex, the supercluster complex where we live.
1025 10 Ym 1.37 billion light years
= 1.3×1025 m = 13 Ym
Length of the Sloan Great Wall, a giant wall of galaxies (galactic filament).[31]
3.26 billion light years
=30.8 Ym = 1 gigaparsec
1 gigaparsec
4 billion light years
=37.84 Ym
Length of the Huge-LQG, a group of 73 quasars
1026 100 Ym 1×1010 light-years
= 9.5×1025 m = 95 Ym
Estimated light travel distance to certain quasars. Length of the Hercules-Corona Borealis Great Wall, a colossal wall of galaxies, the largest and the most massive structure in the observable universe as of 2014.
13.42 billion light years
=1.27×1026 m = 127 Ym
Estimated light travel distance to UDFj-39546284, the most distant object ever observed
9.2×1010 light years
= 8.7×1026 m = 870 Ym
Approximate diameter (comoving distance) of the visible universe[2]
1027 1000 Ym 130 billion light years
= 1.2×1027 m = 1200 Ym
Lower bound of the (possibly infinite) radius of the universe, if it is a 3-sphere, according to one estimate using the WMAP data at 95% confidence.[32] It equivalently implies that there are at minimum 21 particle horizon-sized volumes in the universe.
${\displaystyle 10^{10^{115}}}$[note 2] ${\displaystyle 10^{10^{115}}}$ Ym ${\displaystyle 10^{10^{115}}}$ megaparsecs
= ${\displaystyle 10^{10^{115}}}$ m
= ${\displaystyle 10^{10^{115}}}$Ym
According to the laws of probability, the distance one must travel until one encounters a volume of space identical to our observable universe with conditions identical to our own.[33][34]
${\displaystyle 10^{10^{10^{122}}}}$[note 2] ${\displaystyle 10^{10^{10^{122}}}}$ Ym ${\displaystyle 10^{10^{10^{122}}}}$ Mpc
= ${\displaystyle 10^{10^{10^{122}}}}$ m
= ${\displaystyle 10^{10^{10^{122}}}}$Ym
Maximum size of universe after cosmological inflation, implied by one resolution of the No-Boundary Proposal[35]

## 10 micrometres

To help compare different orders of magnitude, this page lists lengths between 10−5 m and 10−4 m (10 µm and 100 µm).

## 100 micrometres

To help compare different orders of magnitude, this page lists lengths between 10−4 m and 10−3 m (100 µm and 1 mm).

• 100 µm – 1/10 of a millimetre
• 100 µm – 0.00394 inches
• 100 µm – average diameter of a strand of human hair[1]
• 100 µm – thickness of a coat of paint
• 100 µm – length of a dust particle
• 110 µm – halfway between the Planck scale and the diameter of the Observable universe,
√(8.8×1026meters/1.6×10−35meters) × 1.6×10−35meters=110 µm
• 120 µm – diameter of a human ovum
• 170 µm – length of the largest sperm cell in nature, belonging to the Drosophila bifurca fruit fly[38][39]
• 181 µm – maximum width of a strand of human hair[1]
• 100–400 µm – length of Demodex mites living in human hair follicles
• 200 µm – typical length of Paramecium caudatum, a ciliate protist
• 250–300 µm – length of a dust mite[40]
• 340 µm – length of a single pixel on a 17-inch monitor with a resolution of 1024×768
• 500 µm – typical length of Amoeba proteus, an amoeboid protist
• 500 µm – MEMS micro-engine[citation needed]
• 560 µm - thickness of the central area of a human cornea[41]
• 760 µm – thickness of an identification card

## 1 millimetre

To help compare different orders of magnitude this page lists lengths between 10−3 m and 10−2 m (1 mm and 1 cm).

• 1.0 mm – 1/1000 of a metre
• 1.0 mm – 0.03937 inches or 5/127 (exactly)
• 1.0 mm – side of square of area 1 mm²
• 1.0 mm – diameter of a pinhead
• 1.5 mm – length of average flea[42]
• 2.54 mm – distance between pins on old DIP (dual-inline-package) electronic components
• 5 mm – length of average red ant
• 5.56×45mm NATO – standard ammunition size
• 6 mm – approximate width of a pencil
• 7.62×51mm NATO – common military ammunition size[43]
• 8 mm – width of old-format home movie film

## 1 centimetre

To help compare different orders of magnitude this page lists lengths between 10−2 m and 10−1 m (1 cm and 10 cm).

## 1 decimetre

To help compare different orders of magnitude this page lists lengths between 10 centimetres and 100 centimetres (10−1 metre and 1 metre).

### Conversions

10 centimetres (abbreviated to 10 cm) is equal to:

### Human-defined scales and structures

• 10.16 cm = 1.016 dm – 1 hand used in measuring height of horses (4 inches)
• 12 cm = 1.2 dm – diameter of a Compact Disc (CD) (= 120 mm)
• 15 cm = 1.5 dm – length of a Bic pen with cap on
• 22 cm = 2.2 dm – diameter of a typical Association football (soccer ball)
• 30 cm = 3 dm – typical school-use ruler length (= 300 mm)
• 30.48 cm = 3.048 dm – 1 foot (measure)
• 60 cm = 6 dm – standard depth (front to back) of a domestic kitchen worktop in Europe (= 600 mm)
• 90 cm = 9 dm – average length of a rapier, a fencing sword[47]
• 91.44 cm = 9.144 dm – one yard (measure)

## 1 meter

Leonardo da Vinci drew the Vitruvian Man within a square of side 1.83 metres and a circle about 1.2 metres in radius

To help compare different orders of magnitude this page lists lengths between one metre and ten metres. Light travels 1 metre in 1299,792,458, or 3.3356409519815E-9 of a second.

1 metre is:

### Human-defined scales and structures

• 1 m – approximate height of the top part of a doorknob on a door
• 1.435 m – standard gauge of railway track used by about 60% of railways in the world = 4' 8½"
• 2.77–3.44 m – wavelength of the broadcast radio FM band 87–108 MHz
• 3.05 m – the length of an old Mini
• 8.38 m – the length of a London Bus (Routemaster)

### Nature

• 1 m – height of Homo floresiensis (the "Hobbit")
• 1.15 m – a pizote (mammal)
• 1.37 m – average height of an Andamanese person
• 1.63 m – (5 feet 4 inches) (or 64 inches) - height of average US female human as of 2002 (source: US Centers for Disease Control and Prevention (CDC)).
• 1.75 m – (5 feet 8 inches) - height of average US male human as of 2002 (source: US CDC as per female above)
• 2.72 m – (8 feet 11 inches) - tallest known human being (Robert Wadlow)[52]
• 3.63 m – the record wingspan for living birds (a wandering albatross)
• 5.20 m – height of a giraffe[53]
• 5.5 m – height of a Baluchitherium, the largest land mammal ever lived
• 7 m – wingspan of Argentavis, the largest flying bird known
• 7.50 m – approximate length of the human gastrointestinal tract

## 1 decametre

A Blue whale has been measured as 33 metres long; this drawing compares its length to that of a human diver and a dolphin

To help compare different orders of magnitude this page lists lengths between 10 metres and 100 metres.

### Conversions

10 metres (very rarely termed a decametre which is abbreviated as dam) is equal to:

### Sports

• 11 metres – approximate width of a doubles tennis court
• 15 metres – width of a standard FIBA basketball court
• 15.24 metres – width of an NBA basketball court (50 feet)
• 18.44 metres – distance between the front of the pitcher's rubber and the rear point of home plate on a baseball field (60 feet, 6 inches)[54]
• 20 metres – length of cricket pitch (22 yards)[55]
• 27.43 metres – distance between bases on a baseball field (90 feet)
• 28 metres – length of a standard FIBA basketball court
• 28.65 metres – length of an NBA basketball court (94 feet)
• 49 metres – width of an American football field (53⅓ yards)
• 59.436 metres – width of a Canadian football field (65 yards)
• 70 metres – typical width of soccer field
• 91 metres – length of American football field (100 yards, measured between the goal lines)
• 105 metres – length of football pitch (UEFA Stadium Category 3 and 4)

## 1 hectometre

The Great Pyramid of Giza is 138.8 metres high.
British driver location sign and location marker post on the M27 in Hampshire. The location marker posts are installed at 100-metre intervals[58]

To compare different orders of magnitude this page lists lengths between 100 metres and 1000 metres (1 kilometre).

### Conversions

100 metres (sometimes termed a hectometre) is equal to:

• 328 feet
• one side of a 1 hectare square
• a fifth of a modern li, a Chinese unit of measurement
• the approximate distance travelled by light in 300 nanoseconds

## 1 kilometre

Mount Fuji is 3.776 kilometres (3,776 metres) high

To help compare different orders of magnitude this page lists lengths between 1 kilometre and 10 kilometres (103 and 104 metres).

### Conversions

1 kilometre (unit symbol km) is equal to:

## 1 myriametre

The Strait of Gibraltar is 13 kilometres wide

To help compare different orders of magnitude this page lists lengths between 10 and 100 kilometres (104 to 105 metres). The myriametre (sometimes also spelled myriameter, myriometre and myriometer) (10,000 metres) is a deprecated unit name; the decimal metric prefix myria- (sometimes also written as myrio-) is obsolete and not included among the prefixes when the International System of Units was introduced in 1960.

### Conversions

10 kilometres is equal to:

## 100 kilometres

The Suez Canal is 163 kilometres long

A length of 100 kilometers (about 62 English miles), as a rough amount, is relatively common in measurements on Earth and for some astronomical objects. It is the altitude at which the FAI defines spaceflight to begin. To help compare orders of magnitude, this page lists lengths between 100 and 1,000 kilometres (105 and 106 metres).

### Conversions

A distance of 100 kilometres is equal to about 62 miles (or 62.13711922 miles).

## 1 megametre

Small planets, the Moon and dwarf planets in our solar system have diameters from one to ten million metres. Top row: Mars (left), Mercury (right); bottom row: Moon (left), Pluto (center), and Haumea (right), to scale.

To help compare different orders of magnitude this page lists lengths starting at 106 m (1 Mm or 1,000 km).

### Conversions

1 megametre is equal to:

## 10 megametres

Planets from Venus up to Uranus have diameters from ten to one hundred million metres. Top row: Uranus (left), Neptune (right); middle row: Earth (left), Sirius B (center), and Venus (right), to scale.

To help compare different orders of magnitude, this page lists lengths starting at 107 metres (10 megametres or 10,000 kilometres).

### Conversions

10 megametres (10 Mm) is

## 100 megametres

The Earth-Moon orbit, Saturn, OGLE-TR-122b, Jupiter, and other objects, to scale. Click on image for detailed view and links to other length scales.

To help compare different orders of magnitude, this page lists lengths starting at 108 metres (100 megametres or 100,000 kilometres or 62,150 miles).

## 1 gigametre

Upper part: Gamma Orionis, Algol B, the Sun (centre), underneath their darker mirror images (artist's interpretation), and to scale.

To help compare different distances this page lists lengths starting at 109 metres (1 gigametre (Gm) or 1 billion metres).

## 10 gigametres

Rigel and Aldebaran (top left and right) compared to smaller stars, the Sun (very small dot in lower middle, with orbit of mercury as yellow ellipse) and transparent sphere with radius of one light minute: click image for larger view and links to other scales.

To help compare different distances this page lists lengths starting at 1010 metres (10 gigametres (Gm) or 10 million kilometres, or 0.07 Astronomical units).

## 100 gigametres

From largest to smallest: Jupiter's orbit, red supergiant star Betelgeuse, Mars' orbit, Earth's orbit, star R Doradus, and orbits of Venus, Mercury. Inside R Doradus' depiction are the blue giant star Rigel and red giant star Aldebaran. The faint yellow glow around the Sun represents one light minute. Click image to see more details and links to their scales.

To help compare distances at different orders of magnitude this page lists lengths starting at 1011 metres (100 Gm or 100 million kilometres or 0.7 astronomical units).

• 109 Gm — 0.7 AU — Distance between Venus and the Sun
• 149.6 Gm (93.0 million mi) — 1.0 AU — Distance between the Earth and the Sun - the definition of the astronomical unit
• 180 Gm — 1.2 AU — Maximum diameter of Sagittarius A*, the supermassive black hole in the center of Milky Way galaxy
• 228 Gm — 1.5 AU — Distance between Mars and the Sun
• 570 Gm — 3.8 AU — Length of the tail of Comet Hyakutake measured by Ulysses; the actual value could be much higher
• 591 Gm — 4.0 AU — Minimum distance between the Earth and Jupiter
• 624 Gm — 4.2 AU — Diameter of Antares
• 780 Gm — 5.2 AU — Distance between Jupiter and the Sun
• 965 Gm — 6.4 AU — Maximum distance between the Earth and Jupiter

## 1 terametre

8 things in the Terameter group
Comparison of size of the Kuiper belt (large faint torus) with the star VY Canis Majoris (at its previous estimate, within Saturn's orbit), Betelgeuse (inside Jupiter's orbit) and R Doradus (small central red sphere) together with the orbits of Neptune and Uranus, to scale. The yellow ellipses represent the orbits of each planet and the dwarf planet Pluto.

To help compare different distances, this page lists lengths starting at 1012 m (1 Tm or 1 billion km or 6.7 astronomical units). Less than 1 Terameter from earth to the Sun

• 1.079 Tm — 7.2 AU — One light-hour
• 1.4 Tm — 9.5 AU — Distance between Saturn and the Sun
• 1.97 Tm — 13.2 AU — revised estimated diameter of VY Canis Majoris. The newly improved measurement was 30% lower than the previous 2007 estimate.[98]
• 2.0 Tm — 13.4 AU — Diameter of one of the largest known stars, KY Cygni
• 2.4 Tm — 15.9 AU — estimated diameter of UY Scuti, the largest known star as of 2013
• 2.8 Tm — 18.72 AU — previous estimated diameter of VY Canis Majoris, as of 2007.[99] The size was revised in 2012 through improved measurement techniques.[98]
• 2.9 Tm — 19.4 AU — Distance between Uranus and the Sun
• 4.4 Tm — 29.4 AU — Perihelion distance of Pluto
• 4.5 Tm — 30.1 AU — Distance between Neptune and the Sun
• 4.5 Tm — 30.1 AU — Inner radius of the Kuiper belt
• 5.7 Tm — 38.1 AU — Perihelion distance of Eris
• 7.3 Tm — 48.8 AU — Aphelion distance of Pluto
• 7.5 Tm — 50.1 AU — Outer radius of the Kuiper Belt, inner boundary of the Oort Cloud

## 10 terametres

Sedna's orbit (left) is longer than 100 Tm, but other lengths are between 10 and 100 Tm: Comet Hale-Bopp's orbit (lower, faint orange); one light-day (yellow spherical shell with yellow Vernal point arrow as radius); the heliosphere's termination shock (blue shell); and other arrows show positions of Voyager 1 (red) and Pioneer 10 (green). Click on image for larger view and links to other scales.

To help compare different distances this page lists lengths starting at 1013 m (10 Tm or 10,000 million km or 67 astronomical units).

## 100 terametres

The largest yellow sphere indicates one light month distance from the Sun. Click the image for larger view, more details and links to other scales.

To help compare different distances this page lists lengths starting at 1014 m (100 Tm or 100,000 million km or 670 astronomical units).

## 1 petametre

Largest circle with yellow arrow indicates one light year from Sun; Cat's Eye Nebula on left and Barnard 68 in middle are depicted in front of Comet 1910 A1's orbit. Click image for larger view, details and links to other scales.

To help compare different distances this page lists lengths starting at 1015 m (1 Pm or 1,000,000 million km or 6685 astronomical units (AU) or 0.11 light years).

## 10 petametres

Objects with size order of magnitude 1e16m: Ten light years (94.6 Pm) radius circle with yellow Vernal Point arrow; Bubble Nebula (NGC 7635), left; Dumbbell Nebula (NGC 6853), right; one light year shell lower right with the smaller Cat's Eye Nebula (NGC_6543) and Barnard 68 adjacent.
1e16m lengths: Ten light years (94.6 Pm) yellow shell; Sirius below right; BL Ceti below left; Proxima and Alpha Centauri upper right; light year shell with Comet 1910 A1's orbit inside top right

To help compare different distances this page lists lengths starting at 1016 m (10 Pm or 66,800 AU, 1.06 light years).

• 15 Pm — 1.59 light years — Possible outer radius of Oort cloud
• 20 Pm — 2.11 light years — maximum extent of influence of the Sun's gravitational field
• 30.9 Pm — 3.26 light years — 1 parsec
• 39.9 Pm — 4.22 light years — Distance to Proxima Centauri (nearest star to Sun)
• 81.3 Pm — 8.59 light years — Distance to Sirius

## 100 petametres

Lengths with order of magnitude 1e17m: yellow Vernal Point arrow traces hundred light year radius circle with smaller ten light year circle at right; globular cluster Messier 5 in background; 12 light year radius Orion Nebula middle right; 50 light year wide view of the Carina Nebula bottom left; Pleiades cluster and Bubble nebula with similar diameters each around 10 light years bottom right; grey arrows show distances from Sun to stars Aldebaran (65 light years) and Vega (25 light years).

To help compare different distances this page lists lengths between 1017 m (100 Pm or 11 light years) and 1018 m (106 light years).

• 110 Pm — 12 light years — Distance to Tau Ceti
• 230 Pm — 24 light years — Diameter of the Orion Nebula[105][106]
• 240 Pm — 25 light years — Distance to Vega
• 260 Pm — 27 light years — Distance to Chara, a star approximately as bright as our Sun. Its faintness gives us an idea how our Sun would appear when viewed from even so close a distance as this.
• 350 Pm — 37 light years — Distance to Arcturus
• 400 Pm — 42 light years — Distance to Capella
• 620 Pm — 65 light years — Distance to Aldebaran

## 1 exametre

Lengths with order of magnitude 1e18m: thousand light year radius circle with yellow arrow and 100 light year circle at right with globular cluster Messier 5 within and Carina Nebula in front; globular cluster Omega Centauri to left of both; part of the 1400 light year wide Tarantula Nebula fills the background.

This list includes distances between 1 and 10 exametres (1018 m). To help compare different distances this page lists lengths between 1018 m (1 Em or 105.7 light years) and 1019 m (1057 light years).

## 10 exametres

To help compare different orders of magnitude, this page lists distances starting at 10 Em (1019 m or 1,100 light years).

## 100 exametres

To help compare different orders of magnitude, this page lists distances starting at 100 Em (1020 m or 11,000 light years).

## 1 zettametre

The zettametre (SI symbol: Zm) is a unit of length in the metric system equal to 1021 metres.[111]

To help compare different orders of magnitude, this page lists distances starting at 1 Zm (1021 m or 110,000 light years).

## 10 zettametres

To help compare different orders of magnitude, this page lists distances starting at 10 Zm (1022 m or 1.1 million light years).

## 100 zettametres

To help compare different orders of magnitude, this page lists distances starting at 100 Zm (1023 m or 11 million light years).

## 1 yottametre

The yottametre or yottameter in the US ( SI symbol: Ym) is a unit of length in the metric system equal to 1024 metres[111]

To help compare different orders of magnitude, this page lists distances starting at 1 Ym (1024 m or 105.702 million light years).

## 10 yottametres

The universe within 1 billion light years of Earth

To help compare different orders of magnitude, this page lists distances starting at 10 Ym (1025 m or 1.1 billion light-years). At this scale, expansion of the universe becomes significant. Distance of these objects are derived from their measured redshifts, which depends on the cosmological models used.

• 13.7 Ym — 1.37 billion light-years — Length of the Sloan Great Wall
• 18 Ym — redshift 0.16 — 1.9 billion light-years — Distance to the quasar 3C 273 (light travel distance)
• 33 Ym — 3.5 billion light-years — Maximum distance of the 2dF Galaxy Redshift Survey (light travel distance)
• 37.8 Ym — 4 billion light-years — Length of the Huge-LQG, one of the largest and most massive known cosmic structure.
• 75 Ym — redshift 0.95 — 8 billion light-years — Approximate distance to the supernova SN 2002dd in the Hubble Deep Field North (light travel distance)
• 85 Ym — redshift 1.6 — 9 billion light-years — Approximate distance to the gamma ray burst GRB 990123 (light travel distance)
• 94.6 Ym — 10 billion light-years — Approximate distance to quasar OQ172

## 100 yottametres

To help compare different orders of magnitude, this page lists distances greater than 100 Ym (1026 m or 11 billion light years). At this scale, expansion of the universe becomes significant. Distance of these objects are derived from their measured redshifts, which depends on the cosmological models used.

Distances longer than 100 Ym

• 130 Ym — redshift 6.41 — 13 billion light years — Light travel distance (LTD) to the quasar SDSS J1148+5251
• 130 Ym — redshift 1000 — 13.7 billion light years — Distance (LTD) to the source of the cosmic microwave background radiation; radius of the observable universe measured as a LTD
• 260 Ym — 27.4 billion light years — Diameter of the observable universe (double LTD)
• 440 Ym — 46 billion light years — Radius of the universe measured as a comoving distance.
• 590 Ym — 62 billion light years — Cosmological event horizon: the largest comoving distance from which light will ever reach us (the observer) at any time in the future
• <1,000 Ym (1 kYm in older usage, or 1 brontometer in unofficial nomenclature) — Size of universe beyond the cosmic light horizon, depending on its curvature; if the curvature is zero (i.e. the universe is spatially flat), the value is infinite (see shape of the Universe)

## Notes

1. ^ a b c The exact category (asteroid, dwarf planet or planet) to which particular Solar System objects belong, has been subject to some revision since the discovery of extrasolar planets and trans-Neptunian objects
2. ^ a b 10115 is 1 followed by 115 zeroes, or a googol multiplied by a quadrillion. 1010115 is 1 followed by a quadrillion googol zeroes. 101010122is 1 followed by 1010122 (a googolplex10 sextillion) zeroes.
3. ^ a b c m is an abbreviation of metre; cm of centimetre; dm of decimetre; m2 is short for square metre; m3 is short for cubic metre
4. ^ km is an abbreviation of kilometre

## References

1. According to The Physics Factbook, the diameter of human hair ranges from 17 to 181 μm. Ley, Brian (1999). "Width of a Human Hair". The Physics Factbook. Cite error: Invalid `<ref>` tag; name "Physics_Factbook" defined multiple times with different content (see the help page). Cite error: Invalid `<ref>` tag; name "Physics_Factbook" defined multiple times with different content (see the help page).
2. Cliff Burgess; Fernando Quevedo (November 2007). "The Great Cosmic Roller-Coaster Ride". Scientific American (print). Scientific American, Inc. p. 55.
3. ^ Carl R. Nave. "Cowan and Reines Neutrino Experiment". Retrieved 2008-12-04. (6.3 × 10−44 cm2, which gives an effective radius of about 2 × 10−23 m)
4. ^ Carl R. Nave. "Neutron Absorption Cross-sections". Retrieved 2008-12-04. (area for 20 GeV about 10 × 10−42 m2 gives effective radius of about 2 × 10−21 m; for 250 GeV about 150 × 10−42 m2 gives effective radius of about 7 × 10−21 m)
5. ^ gravitational waves that originate tens of millions of light years from Earth are expected to distort the 4 kilometer mirror spacing by about 10−18 m, less than one-thousandth the charge diameter of a proton. Equivalently, this is a relative change in distance of approximately one part in 1021. "On September 14, 2015 at 09:50:45 UTC the two detectors of the Laser Interferometer Gravitational-Wave Observatory simultaneously observed a transient gravitational-wave signal. The signal sweeps upwards in frequency from 35 to 250 Hz with a peak gravitational-wave strain of 1.0×10−21." B. P. Abbott et al. (LIGO Scientific Collaboration and Virgo Collaboration), "Observation of Gravitational Waves from a Binary Black Hole Merger", Phys. Rev. Lett. 116, 061102, published 11 February 2016.
6. ^ Randolf Pohl; Aldo Antognini; François Nez; Fernando D. Amaro; François Biraben; João M. R. Cardoso; Daniel S. Covita; Andreas Dax; Satish Dhawan; Luis M. P. Fernandes; Adolf Giesen; Thomas Graf; Theodor W. Hänsch; Paul Indelicato; Lucile Julien; Cheng-Yang Kao; Paul Knowles; Eric-Olivier Le Bigot; Yi-Wei Liu; José A. M. Lopes; Livia Ludhova; Cristina M. B. Monteiro; Françoise Mulhauser; Tobias Nebel; Paul Rabinowitz; et al. (8 July 2010). "The size of the proton". Nature. 466 (7303): 213–216. Bibcode:2010Natur.466..213P. doi:10.1038/nature09250. PMID 20613837. Retrieved 2010-07-09.
7. ^ Carl R. Nave. "Scattering Cross Section". Retrieved 2009-02-10. (diameter of the Scattering Cross Section of an 11 MeV proton with a target proton)
8. ^ NIST. CODATA Value: classical electron radius. Retrieved 2009-02-10
9. ^ H. E. Smith. "The Scale of the Universe". UCSD. Retrieved 2009-02-10. ~10−13cm
10. ^ Mark Winter (2008). "WebElements Periodic Table of the Elements / Sulfur / Radii". Retrieved 2008-12-06.
11. ^ Flahaut, E.; Bacsa R; Peigney A; Laurent C. (2003). "Gram-Scale CCVD Synthesis of Double-Walled Carbon Nanotubes". Chemical Communications. 12 (12): 1442–1443. doi:10.1039/b301514a. PMID 12841282. Retrieved 2008-11-14.
12. ^ Stewart, Robert. "Dr.". Radiobiology Software. Archived from the original on 2010-06-30. Retrieved 2015-05-20.
13. ^ Dominique Langevin. "Chapter 10: DNA-Surfactant/Lipid Complexes at Liquid Interfaces". In Rita S Dias and Bjorn Lindman. DNA Interactions with Polymers and Surfactants (PDF). Hoboken, NJ: John Wiley & Sons, Inc. p. 265. ISBN 978-0-470-25818-7. Retrieved 24 May 2014. DNA has 20 elementary charges per helical turn over the corresponding length of 3.4nm
14. ^ helpwithpcs.com http://www.helpwithpcs.com/hardware/hard-drive-basics.php. Retrieved 13 July 2016. Missing or empty `|title=` (help)
15. ^ Cohn, J. University of California, Berkeley Lyman alpha systems and cosmology. Retrieved 2009-02-21
16. ^ Seth, S.D.; Seth, Vimlesh (2009). Textbook of Pharmacology (3rd ed.). Elsevier. p. X111. ISBN 978-81-312-1158-8. Retrieved 19 July 2016.
17. ^ Color
18. ^ "Size of bacteria". What are bacteria?. Retrieved 19 July 2016.
19. ^ "Engineering properties of spider silk" (PDF). web.mit.edu. Retrieved 19 July 2016.
20. ^ Doohan, Jim. "Blood cells". biosbcc.net. Retrieved 19 July 2016.
21. ^ "Animal Records". Smithsonian National Zoological Park. Retrieved 2007-05-29.
22. ^ Thomas, P. C.; Parker, J. Wm.; McFadden, L. A.; et al. (2005). "Differentiation of the asteroid Ceres as revealed by its shape". Nature. 437 (7056): 224–226. Bibcode:2005Natur.437..224T. doi:10.1038/nature03938. PMID 16148926.
23. ^ Spacecraft escaping the Solar System
24. ^ Twin Keck telescopes probe dual dust disks
25. ^ "medical science - Length of uncoiled human DNA - Skeptics Stack Exchange". Retrieved 13 March 2015.
26. ^ Shiga, David. "Sun's 'twin' an ideal hunting ground for alien life". New Scientist. Retrieved 2007-10-03.
27. ^ Christian, Eric; Samar, Safi-Harb. "How large is the Milky Way?". Retrieved 2008-11-14.
28. ^ Duncan, Martin (2008). "16". Physics 216 – Introduction to Astrophysics (PDF). Retrieved 2008-11-14.
29. ^ "Milky Way fatter than first thought". The Sydney Morning Herald. Australian Associated Press. 2008-02-20. Retrieved 2008-11-14.
30. ^ http://www.atlasoftheuniverse.com/superc/hor.html The Horologium Supercluster
31. ^ J. R. Gott III et al., Astrophys. J., 624, 463 (2005). Figure 8 – "Logarithmic Maps of the Universe" – is available as a poster from the homepage of Mario Juric.
32. ^ http://arxiv.org/abs/astro-ph/0605709v2 How Many Universes Do There Need To Be?
33. ^ "Parallel universes. Not just a staple of science fiction, other universes are a direct implication of cosmological observations.", Tegmark M., Sci Am. 2003 May;288(5):40-51.
34. ^ Max Tegmark (2003). "Parallel Universes". In "Science and Ultimate Reality: from Quantum to Cosmos", honoring John Wheeler's 90th birthday. J. D. Barrow, P.C.W. Davies, & C.L. Harper eds. Cambridge University Press (2003). arXiv:astro-ph/0302131. Bibcode:2003astro.ph..2131T.
35. ^ http://arxiv.org/abs/hep-th/0610199 "Susskind's Challenge to the Hartle-Hawking No-Boundary Proposal and Possible Resolutions "
36. ^ a b IST - Innovative Sintering Technologies Ltd. "Fibreshape applications". Retrieved 2008-12-04. Histogram of cotton thickness
37. ^ Morton Lippmann (2000). Environmental Toxicants: Human Exposures and Their Health Effects. John Wiley and Sons. p. 453. ISBN 0-471-29298-2. ISBN 978-0-471-29298-2. Retrieved 2008-12-04. 20 µm .. 5 µm
38. ^ Kim Popiolek. "Dr. Charles Lindemann's Lab: Sperm Facts". Oakland University.
39. ^ Santoso, Alex (June 17, 2006). "World's Biggest Sperm Belongs to a Tiny Fly". Neatorama.
40. ^ House Dust Mites HYG-2157-97. Retrieved 2008-12-04
41. ^ "Evaluation of corneal thickness and topography in normal eyes using the Orbscan corneal topography system". Br J Ophthalmol. 83 (7): 774–8. July 1999. doi:10.1136/bjo.83.7.774. PMC 1723104. PMID 10381661.
42. ^ Order Siphonaptera – Fleas – BugGuide.Net Accessed 29 April 2014
43. ^
44. ^ "USGA: Guide to the Rules on Clubs and Balls". USGA. Retrieved 2011-09-30.
45. ^ "Official Rules". MLB. Retrieved 2011-09-30.
46. ^ "Credit Card Dimensions". Retrieved 2011-09-30.
47. ^ "What is a rapier - Renaissance swords Rapiers". 2-Clicks Swords.
48. ^ Bohun B. Kinloch, Jr. and William H. Scheuner. "Pinus lambertiana". Archived from the original on 8 June 2011. Retrieved June 2011. Check date values in: `|access-date=` (help)
49. ^ Laws of the Game (PDF), FIFA
50. ^ IAAF International Association of Athletics Federations - IAAF.org - Statistics - Top Lists, archived from the original on 2008-01-16, retrieved 2010-04-09
51. ^ IAAF International Association of Athletics Federations - IAAF.org - Past Results, archived from the original on 2011-06-04, retrieved 2010-04-09
52. ^ "Tallest Man". Guinness World Records. Archived from the original on 2011-06-05. Retrieved 2010-06-10.
53. ^ Dagg, A. I. (1971), Mammalian Species 5 (Giraffa camelopardalis ed.), pp. 1–8
54. ^ "Rule 1.04 The Playing Field" (PDF). Official Baseball Rules. Major League Baseball. 25 January 2010. pp. 1–5. Archived (PDF) from the original on 27 April 2011. Retrieved 1 April 2011. See especially Diagram No. 1, page 3.
55. ^ "Law 7 (The pitch)". Laws of Cricket. Marylebone Cricket Club. October 2010. Archived from the original on 14 May 2011. Retrieved 1 April 2011.
56. ^ "Animal Records". Smithsonian National Zoological Park. Archived from the original on 25 April 2009. Retrieved 29 May 2007.
57. ^ "Niagara Falls Geology Facts & Figures". Niagara Parks Commission. Retrieved 29 June 2011.
58. ^ Highways Agency. "Driver Location Signs - Frequently Asked Questions". Retrieved 2010-02-10.
59. ^ "Kingda Ka (Six Flags Great Adventure)". Archived from the original on 25 April 2009. Retrieved 2009-04-18.
60. ^ "Tour Eiffel". Retrieved 15 September 2010.
61. ^ "Burj Dubai all set for 09/09/09 soft opening". Emirates Business 24-7. Archived from the original on 19 January 2009. Retrieved 17 January 2009.
62. ^
63. ^ "Tallest tree in the world: coast redwood". Monumental Trees, an inventory of big and old trees worldwide.
64. ^ Fujiwara, Akira; et al. (2 June 2006). "The Rubble-Pile Asteroid Itokawa as Observed by Hayabusa". Science. 312 (5778): 1330–1334. doi:10.1126/science.1125841. PMID 16741107. Archived from the original on 2 April 2009. Retrieved 2009-04-20.
65. ^ "long wave". Oxford Dictionaries. Retrieved 12 March 2011. wavelength above one kilometre (and a frequency below 300 kHz)
66. ^ "Golden Gate Bridge official website". Retrieved 10 June 2012.
67. ^ "nautical mile". Merriam Webster. Retrieved 12 March 2011.
68. ^ Akashi Kaikyo Bridge @ Everything2.com, Everything2, 2002-09-09, retrieved 2009-04-19
69. ^ "Three Gorges Dam". encyclopedia.com. Cengage Learning.
70. ^ Jeffrey Friedl (2008-12-09), Supporting the Longest Suspension Bridge in the World, archived from the original on 2009-04-25, retrieved 2009-04-19
71. ^ New height of world's railway born in Tibet, Xinhua News Agency, 2005-08-24, archived from the original on 2009-04-25, retrieved 2009-04-19
72. ^
73. ^ "Russians in landmark Baikal dive". BBC News. 29 July 2008. Retrieved 12 March 2011. current record of 1,637m was set in Lake Baikal in the 1990s
74. ^ "Kosciuszko National Park lookouts and scenery". Office of Environment & Heritage: NSW National Parks & Wildlife Service.
75. ^ "Carstensz Pyramid details". Carstensz Pyramid Site.
76. ^ Haugen, Einar, Norwegian English Dictionary, 1965, Oslo: Universitetsforlaget and Madison: University of Wisconsin Press, s.v. mil
77. ^ https://sizes.com/units/farsakh.htm
78. ^ "IAAF Competition Rules 2008" (pdf). IAAF. p. 195. Archived from the original on 2009-04-25. Retrieved 2009-04-20.
79. ^ Gregory Kennedy. "Stratolab, an Evolutionary Stratospheric Balloon Project".
80. ^ Wise, Jeff (October 1, 2009). "Turkey Building the World's Deepest Immersed Tube Tunnel". Popular Mechanics. Retrieved January 2011. Check date values in: `|access-date=` (help)
82. ^
83. ^ Plescia, Jeff (1997-10-01). "Height of Martian vs. Earth mountains". Questions and Answers about Mars terrain and geology. Retrieved 2009-04-20.
84. ^ "High Speed 1 Project Hoem". www.betchel.com. Betchel Corporation. Retrieved 8 February 2015.
85. ^ Thomas, P. C.; Parker, J. Wm.; McFadden, L. A.; et al. (2005). "Differentiation of the asteroid Ceres as revealed by its shape". Nature. 437 (7056): 224–226. Bibcode:2005Natur.437..224T. doi:10.1038/nature03938. PMID 16148926.
86. ^ "FAQ-Alaska Highway Facts". The MILEPOST. Archived from the original on 2007-09-29. Retrieved 2007-08-25. 1,390 miles ... Alaska Route 2 and often treated as a natural extension of the Alaska Highway
87. ^ Downward, R.J.; Bromell, J.E. (March 1990). "The development of a policy for the management of dingo populations in South Australia". Proceedings of the Fourteenth Vertebrate Pest Conference 1990. University of Nebraska - Lincoln. Archived from the original on 2009-09-04. Retrieved 2009-08-31.
88. ^ "China's Great Wall far longer than thought: survey". AFP. 2009-04-20. Archived from the original on 27 April 2009. Retrieved 2009-04-20.
89. ^ CIS railway timetable, route No. 002, Moscow-Vladivostok. Archived 2009-12-03.
90. ^ CIS railway timetable, route No. 350, Kiev-Vladivostok. Archived 2009-12-03.
91. ^ McGourty, Christine (2005-12-14). "Hubble finds mass of white dwarf". BBC News. Retrieved 2007-10-13.
92. ^ NASA Staff (10 May 2011). "Solar System Exploration - Earth's Moon: Facts & Figures". NASA. Retrieved 2011-11-06.
93. ^ Sun Fact Sheet
94. ^ Neuroscience: The Science of the Brain [1] p.44
95. ^ Richichi, A.; Roccatagliata, V. Aldebaran's angular diameter: How well do we know it?. Astronomy and Astrophysics, Volume 433, Issue 1, April I 2005, pp.305-312. "We derive an average value of 19.96±0.03 milliarcsec for the uniform disk diameter. The corresponding limb-darkened value is 20.58±0.03 milliarcsec, or 44.2±0.9 Rȯ."
96. ^ Richichi, A. and Roccatagliata, V. derived an angular diameter of 20.58±0.03 milliarcsec, which given a distance of 65 light years yields a diameter of 61 million km
97. ^ "Big and Giant Stars: Rigel". Internetservice Kummer + Oster GbR. Archived from the original on 26 December 2008. Retrieved 2008-11-26. Diameter: 62 * Sun
98. ^ a b Wittkowski, M.; Hauschildt, P.H.; Arroyo-Torres, B.; Marcaide, J.M. (5 April 2012). "Fundamental properties and atmospheric structure of the red supergiant VY CMa based on VLTI/AMBER spectro-interferometry". Astronomy & Astrophysics. 540: L12. arXiv:1203.5194. Bibcode:2012A&A...540L..12W. doi:10.1051/0004-6361/201219126.
99. ^ Humphreys, Roberta (13 October 2006). "VY Canis Majoris: the astrophysical basis of its luminosity". arXiv:astro-ph/0610433.
100. ^ "Comet Hyakutake: Orbital elements and 10-day ephemeris". European Space Agency. Retrieved 2008-12-07.
101. ^ Parthasarathy, M. (2000). "Birth and early evolution of planetary nebulae". Bulletin of the Astronomical Society of India. 28: 217–224. Bibcode:2000BASI...28..217P.
102. ^
103. ^ radius = distance times sin(angular diameter/2) = 0.2 light year. Distance = 3.3 ± 0.9 kly; angular diameter = 20 arcseconds(Reed et al. 1999)
104. ^ Michael Szpir (May–June 2001). "Bart Bok's Black Blobs". American Scientist. Archived from the original on 2003-06-29. Retrieved 2008-11-19. Bok globules such as Barnard 68 are only about half a light-year across and weigh in at about two solar masses
105. ^ Sandstrom, Karin M; Peek, J. E. G.; Bower, Geoffrey C.; Bolatto, Alberto D.; Plambeck, Richard L. (1999). "A Parallactic Distance of 389+24
−21
parsecs to the Orion Nebula Cluster from Very Long Baseline Array Observations". The Astrophysical Journal. 667 (2): 1161–1169. arXiv:0706.2361. Bibcode:2007ApJ...667.1161S. doi:10.1086/520922.
106. ^ diameter=sin(65 arcminutes)*1270 light years=24; where "65.00 x 60.0 (arcmin)" sourced from Revised NGC Data for NGC 1976
107. ^ distance × sin( diameter_angle ), using distance of 5kpc (15.8 ± 1.1 kly) and angle 36.3', = 172 ± 12.5 ly.
108. ^ van de Ven, G.; van den Bosch, R. C. E.; Verolme, E. K.; de Zeeuw, P. T. (January 11, 2006). "The dynamical distance and intrinsic structure of the globular cluster ω Centauri". Astronomy and Astrophysics. 445 (2): 513–543. arXiv:astro-ph/0509228. Bibcode:2006A&A...445..513V. doi:10.1051/0004-6361:20053061. best-fit dynamical distance D=4.8±0.3 kpc ... consistent with the canonical value 5.0±0.2 kpc obtained by photometric methods
109. ^ Harper, Graham M.; Brown, Alexander; Guinan, Edward F. (April 2008). "A New VLA-Hipparcos Distance to Betelgeuse and its Implications" (PDF). The Astronomical Journal. 135 (4): 1430–40. Bibcode:2008AJ....135.1430H. doi:10.1088/0004-6256/135/4/1430.
110. ^ Reid, M. J.; et al. (2009). "Trigonometric Parallaxes of Massive Star Forming Regions: VI. Galactic Structure, Fundamental Parameters and Non-Circular Motions". Astrophysical Journal. 700: 137. arXiv:0902.3913. Bibcode:2009ApJ...700..137R. doi:10.1088/0004-637X/700/1/137.
111. ^ a b "SI Brochure: The International System of Units (SI)". International Committee for Weights and Measures. Organisation Intergouvernementale de la Convention du Mètre. Retrieved 11 October 2014.
112. ^ Local Group