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Space colonization is the use of outer space for colonization, such as permanent habitation, exploitation or territorial claims. Extraterrestrial colonization is...

A space suit or spacesuit is a garment worn to keep a human alive in the harsh environment of outer space, vacuum and temperature extremes. Space suits...

The KH-11 KENNEN (later renamed CRYSTAL, then Evolved Enhanced CRYSTAL System, and codenamed 1010: 82  and Key Hole: 82 ) is a type of reconnaissance satellite...

Nemesis is a hypothetical red dwarf or brown dwarf, originally postulated in 1984 to be orbiting the Sun at a distance of about 95,000 AU (1.5 light-years)...

In the fields of Big Bang theory and cosmology, reionization is the process that caused electrically neutral atoms in the universe to reionize after the...

The National Space Activities Commission (Spanish: Comisión Nacional de Actividades Espaciales, CONAE) is the civilian agency of the government of Argentina...

The southern celestial hemisphere, also called the Southern Sky, is the southern half of the celestial sphere; that is, it lies south of the celestial...

The Transit system, also known as NAVSAT or NNSS (for Navy Navigation Satellite System), was the first satellite navigation system to be used operationally...

Schelte John "Bobby" Bus (born 1956) is an American astronomer and discoverer of minor planets at the Institute for Astronomy of the University of Hawaiʻi...

The light-second is a unit of length useful in astronomy, telecommunications and relativistic physics. It is defined as the distance that light travels...

A luminous supersoft X-ray source (SSXS, or SSS) is an astronomical source that emits only low energy (i.e., soft) X-rays. Soft X-rays have energies in...

Giovanni Antonio Magini (in Latin, Maginus) (13 June 1555 – 11 February 1617) was an Italian astronomer, astrologer, cartographer, and mathematician. He...

The (n-p) reaction, or (n,p) reaction, is an example of a nuclear reaction. It is the reaction which occurs when a neutron enters a nucleus and a proton...

The Scientific Workgroup for Rocketry and Spaceflight (WARR) (German: Wissenschaftliche Arbeitsgemeinschaft für Raketentechnik und Raumfahrt) is a scientific...

Lincoln LaPaz (February 12, 1897 – October 19, 1985) was an American astronomer from the University of New Mexico and a pioneer in the study of meteors...

(480808) 1994 XL1 is a sub-kilometer asteroid, classified as near-Earth object and potentially hazardous asteroid of the Aten group, approximately 200...

Trumpler is a lunar impact crater on the far side of the Moon. It was named by the IAU in 1970 after Swiss-American astronomer Robert Julius Trumpler (1886–1956)...

The Wilksch WAM series is a family of aero-engines for light and general aviation aircraft. WAM series engines are produced by Wilksch Airmotive in Gloucestershire...

2015 YU9, also known as 2015 YB and WY032FF, is a sub-kilometer Hungaria asteroid from the inner region of the asteroid belt, approximately 350 meters...