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The expansion of the universe is the increase in distance between gravitationally unbound parts of the observable universe with time. It is an intrinsic...

The space policy of the United States includes both the making of space policy through the legislative process, and the implementation of that policy in...

67P/Churyumov–Gerasimenko (abbreviated as 67P or 67P/C–G) is a Jupiter-family comet. It is originally from the Kuiper belt and has an orbital period of...

Atlas is a family of US missiles and space launch vehicles that originated with the SM-65 Atlas. The Atlas intercontinental ballistic missile (ICBM) program...

Space warfare is combat in which one or more belligerents are situated in outer space. The scope of space warfare therefore includes ground-to-space warfare...

The study of extraterrestrial atmospheres is an active field of research, both as an aspect of astronomy and to gain insight into Earth's atmosphere. In...

Becquerel is a 167 km-diameter crater at 22.1°N, 352.0°E on Mars, in Arabia Terra in Oxia Palus quadrangle. It is named after Antoine H. Becquerel. Photographs...

Kounotori 5, also known as HTV-5, was the fifth flight of the H-II Transfer Vehicle, an uncrewed cargo spacecraft launched to resupply the International...

Venera 13 (Russian: Венера-13 'Venus 13') was part of the Soviet Venera program meant to explore Venus. Venera 13 and 14 were identical spacecraft built...

Tier One was a Scaled Composites' 1990s–2004 program of suborbital human spaceflight using the reusable spacecraft SpaceShipOne and its launcher White...

Wallace Leslie William Sargent FRS (February 15, 1935 – October 29, 2012) was a British-born American astronomer and the Ira S. Bowen Professor of Astronomy...

Stephenson 2, also known as RSGC2 (Red Supergiant Cluster 2), is a young massive open cluster belonging to the Milky Way galaxy. It was discovered in 1990...

StarBand was a two-way satellite broadband Internet service available in the U.S. from 2000–2015. StarBand ceased operations effective September 30, 2015...

The Tyson Medal is a prize awarded for the best performance in subjects relating to astronomy at the University of Cambridge, England. It is awarded annually...