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Vostok 1 (Russian: Восток, East or Orient) was the first spaceflight of the Vostok programme and the first human orbital spaceflight in history. The Vostok...

The militarisation of space involves the placement and development of weaponry and military technology in outer space. The early exploration of space in...

Tidal acceleration is an effect of the tidal forces between an orbiting natural satellite (e.g. the Moon) and the primary planet that it orbits (e.g. Earth)...

The core of the Sun is considered to extend from the center to about 0.2 of the solar radius (139,000 km; 86,000 mi). It is the hottest part of the Sun...

Sir Martin Ryle FRS (27 September 1918 – 14 October 1984) was an English radio astronomer who developed revolutionary radio telescope systems (see e.g...

The Interplanetary Transport Network (ITN) is a collection of gravitationally determined pathways through the Solar System that require very little energy...

Astronauts are exposed to approximately 72 millisieverts (mSv) while on six-month-duration missions to the International Space Station (ISS). Longer 3-year...

1850 Kohoutek, provisional designation 1942 EN, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 6 kilometers in...

1863 Antinous /ænˈtɪnoʊəs/, provisional designation 1948 EA, is a stony asteroid and near-Earth object, approximately 2–3 kilometers in diameter. It was...