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The Moon is Earth's only natural satellite. It orbits at an average distance of 384,400 km (238,900 mi), about 30 times the diameter of Earth. Over time...

The Blue Marble is a photograph of Earth taken on December 7, 1972, from a distance of around 29,400 kilometers (18,300 miles) from the Earth's surface...

Colonization or settlement of Mars is the theoretical migration of humans to Mars and the establishment of long-term human presence on the planet. The...

Physical cosmology is a branch of cosmology concerned with the study of cosmological models. A cosmological model, or simply cosmology, provides a description...

A geosynchronous orbit (sometimes abbreviated GSO) is an Earth-centered orbit with an orbital period that matches Earth's rotation on its axis, 23 hours...

The Orion Nebula (also known as Messier 42, M42, or NGC 1976) is a diffuse nebula situated in the Milky Way, being south of Orion's Belt in the constellation...

This is a timeline of Solar System exploration ordering events in the exploration of the Solar System by date of spacecraft launch. It includes: All spacecraft...

Solar eclipses on the Moon are caused when the planet Earth passes in front of the Sun and blocks its light. Viewers on Earth experience a lunar eclipse...

A geostationary transfer orbit (GTO) or geosynchronous transfer orbit is a type of geocentric orbit. Satellites that are destined for geosynchronous (GSO)...

The Almaz (Russian: Алмаз, lit. 'Diamond') program was a highly secret Soviet military space station program, begun in the early 1960s. Three crewed military...

Shenzhou 7 (simplified Chinese: 神舟七号; traditional Chinese: 神舟七號; pinyin: Shénzhōu Qī Hào) was the third human spaceflight mission of the Chinese space...

A pulsar timing array (PTA) is a set of galactic pulsars that is monitored and analysed to search for correlated signatures in the pulse arrival times...

In astronomy, the fixed stars (Latin: stellae fixae) are the luminary points, mainly stars, that appear not to move relative to one another against the...

The oxygen-burning process is a set of nuclear fusion reactions that take place in massive stars that have used up the lighter elements in their cores...

Shenzhou 2 (Chinese: 神舟二号) launched on January 9, 2001, was the second unmanned launch of the Shenzhou spacecraft. Inside the reentry capsule were a monkey...

The Tolman–Oppenheimer–Volkoff limit (or TOV limit) is an upper bound to the mass of cold, non-rotating neutron stars, analogous to the Chandrasekhar limit...

Shenzhou 3 (Chinese: 神舟三号) launched on March 25, 2002, was the third unmanned launch of China's Shenzhou spacecraft. This was the first Shenzhou spacecraft...

TeamIndus (incorporated as Axiom Research Labs) is a private for-profit aerospace company headquartered in Bangalore, India. It consists of a team of professionals...

Shenzhou 6 (Chinese: 神舟六号; pinyin: Shénzhōu lìuhào) was the second human spaceflight of the Chinese space program, launched on October 12, 2005, on a Long...

The Space Programme 2040 is a satellite development and launch programme of the Space and Upper Atmosphere Research Commission (Suparco), Pakistan's space...