100 kilometres
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A length of 100 kilometers (about 62 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).
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[edit] Conversions
A distance of 100 kilometres is equal to about 62 miles[1] (or 62.13711922 miles).
[edit] Human-defined scales and structures
- 108 km — length of High Speed 1 between London and the Channel Tunnel[citation needed]
- 111 km — distance covered by one degree of latitude on Earth's surface
- 130 km — range of a Scud-A missile
- 163 km — length of the Suez Canal
- 180 km — distance between Mumbai and Nashik
- 213 km — length of Paris Métro
- 217 km — length of the Grand Union Canal
- 220 km — distance between Pune and Nashik
- 223 km — length of the Madrid Metro
- 300 km — range of a Scud-B missile
- 300 km — the approximate distance travelled by light in one millisecond
- 386 km — altitude of the International Space Station
- 408 km — length of the London Underground (active track)
- 470 km — distance from Dublin to London as the crow flies
- 500 km — widest width of Sweden from east to west
- 550 km — distance from San Francisco to Los Angeles as the crow flies
- 560 km — distance of Bordeaux–Paris, formerly[when?] the longest one-day professional cycling race[citation needed]
- 590 km — length of land boundary between Finland and Sweden
- 600 km — range of a Scud-C missile
- 600 km — height above ground of the Hubble Space Telescope
- 804.67 km — (500 miles) distance of the Indy 500 automobile race
- 871 km — distance from Sydney to Melbourne (along the Hume Highway)
[edit] Nature
- 203 km — length of Sognefjorden, the second largest fjord in the world
- 240 km — widest width of the English Channel
- 430 km — length of the Pyrenees
- 724 km — length of the Om River
- 897 km — length of the River Douro
[edit] Astronomical
- 100 km — the altitude at which the FAI defines spaceflight to begin
- 167 km — diameter of Amalthea, one of Jupiter's inner moons
- 220 km — diameter of Phoebe, the largest of Saturn's outer moons
- 340 km — diameter of Nereid, the third largest moon of Neptune
- 350 km — lower bound of Low Earth orbit
- 420 km — diameter of Proteus, the second largest moon of Neptune
- 468 km — diameter of the asteroid 4 Vesta
- 472 km — diameter of Miranda, one of Uranus' major moons
- 974.6 km — greatest diameter of 1 Ceres,[2] the largest solar system asteroid[note 1]
[edit] See also
[edit] Notes
- ^ The exact category (asteroid/dwarf planet/planet) to which particular solar system objects belong, has been subject to some revision since the discovery of extrasolar planets and trans-Neptunian objects
 Click on the thumbnail image to jump to the desired Human-scale order of length magnitude article: top-left is 1E-6 m, lower-right is 1E5 m.
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[edit] References
- ^ Trueknowledge.com, 2010, webpage: "100 km"
- ^ 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.
| Orders of magnitude for length in E notation | |||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| shorter than one metre: | |||||||||||||||||||||||||
| <−24 | −24 | −23 | −22 | −21 | −20 | −19 | −18 | −17 | −16 | −15 | −14 | −13 | −12 | −11 | −10 | −9 | −8 | −7 | −6 | −5 | −4 | −3 | −2 | −1 | 0 |
| longer than 1 metre: | |||||||||||||||||||||||||
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 |
