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An atmosphere (from Ancient Greek ἀτμός (atmós) 'vapour, steam', and σφαῖρα (sphaîra) 'sphere') is a layer of gasses that envelop an astronomical object...

A meteor shower is a celestial event in which a number of meteors are observed to radiate, or originate, from one point in the night sky. These meteors...

The Lambda-CDM, Lambda cold dark matter, or ΛCDM model is a mathematical model of the Big Bang theory with three major components: a cosmological constant...

In spaceflight, an orbital maneuver (otherwise known as a burn) is the use of propulsion systems to change the orbit of a spacecraft. For spacecraft far...

The Delta 3000 series was an American expendable launch system which was used to conduct 38 orbital launches between 1975 and 1989. It was a member of...

The Space Foundation is an American nonprofit organization, the mission of which is to advocate for all sectors of the global space industry through space...

STS-40, the eleventh launch of Space Shuttle Columbia, was a nine-day mission in June 1991. It carried the Spacelab module for Spacelab Life Sciences 1...

Teegarden's Star c (also known as Teegarden c) is an exoplanet found orbiting in the habitable zone of Teegarden's Star, an M-type red dwarf star 12.5...

This is an incomplete list of astronauts who are resident in any of the countries of Europe, who have reached Earth's orbit, exclusive of the former Soviet...

The northern celestial hemisphere, also called the Northern Sky, is the northern half of the celestial sphere; that is, it lies north of the celestial...

Oleg Dmitriyevich Kononenko (Russian: Олег Дмитриевич Кононенко; Turkmen: Oleg Dmitriýewiç Kononenko; born 21 June 1964) is a Russian cosmonaut. He has...

Quetzalpetlatl Corona is a corona in Lada Terra on the planet Venus. Latitude 68° South, Longitude 357° East. It has a diameter of 780 kilometers, and...

Mercury-Atlas 3 (MA-3) was an unmanned spaceflight of the Mercury program. It was launched unmanned on April 25, 1961 at 16:15 UTC, from Launch Complex...

Space art or astronomical art is a genre of art that focuses on the universe as a frame of reference. Like other genres, space art has many facets and...

G-type asteroids are a relatively uncommon type of carbonaceous asteroid that makes up approximately 5% of asteroids. The most notable asteroid in this...

Adiri is a large, bright albedo feature on Saturn's moon Titan. It is named after the paradise in Melanesian mythology. It is located to the west of the...

OGLE-2019-BLG-0960Lb is an exoplanet that was discovered in January 2021 by gravitational microlensing. It is approximately twice the mass of Earth, making...

The International Space Development Conference (ISDC) is the annual conference of the National Space Society (NSS). Now in its 41st year, these conferences...

Helsinki University Observatory housed the Department of Astronomy at the University of Helsinki, south Finland until end of 2009. It is now an astronomy-themed...

The Astronomical Observatory of Belogradchik or Belogradchik Observatory is an astronomical observatory owned and operated by the Institute of Astronomy...