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Starlink is a satellite internet constellation operated by Starlink Services, LLC, a wholly-owned subsidiary of American aerospace company SpaceX, providing...

In physics, a redshift is an increase in the wavelength, and corresponding decrease in the frequency and photon energy, of electromagnetic radiation (such...

Human spaceflight (also referred to as manned spaceflight or crewed spaceflight) is spaceflight with a crew or passengers aboard a spacecraft, often with...

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

Chandrayaan-1 (pronunciation; from Sanskrit: Chandra, "Moon" and yāna, "craft, vehicle") was the first Indian lunar probe under the Chandrayaan programme...

Tidal locking between a pair of co-orbiting astronomical bodies occurs when one of the objects reaches a state where there is no longer any net change...

A sub-orbital spaceflight is a spaceflight in which the spacecraft reaches outer space, but its trajectory intersects the surface of the gravitating body...

Space tourism is human space travel for recreational purposes. There are several different types of space tourism, including orbital, suborbital and lunar...

A rocket engine uses stored rocket propellants as the reaction mass for forming a high-speed propulsive jet of fluid, usually high-temperature gas. Rocket...

Dream Chaser is an American reusable lifting-body spaceplane developed by Sierra Space. Originally intended as a crewed vehicle, the Dream Chaser Space...

Sergei Pavlovich Korolev (Russian: Сергей Павлович Королёв, romanized: Sergey Pavlovich Korolyov, IPA: [sʲɪrˈɡʲej ˈpavləvʲɪtɕ kərɐˈlʲɵf] ; Ukrainian: Сергій...

Extraterrestrial liquid water is water in its liquid state that naturally occurs outside Earth. It is a subject of wide interest because it is recognized...

The Cerro Tololo Inter-American Observatory (CTIO) is an astronomical observatory located on the summit of Mt. Cerro Tololo in the Coquimbo Region of northern...

International Traffic in Arms Regulations (ITAR) is a United States regulatory agency to restrict and control the export of defense and military technologies...

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

Interkosmos (Russian: Интеркосмос) was a Soviet space program, designed to help the Soviet Union's allies with crewed and uncrewed space missions. The...

The Tsyklon-3, also known as Tsiklon-3 and Cyclone-3 (known as SL-14 by the United States DoD), GRAU index 11K68, was a Soviet, and subsequently Ukrainian...

STS-31 was the 35th mission of NASA's Space Shuttle program. The primary purpose of this mission was the deployment of the Hubble Space Telescope (HST)...

STS-98 was a 2001 Space Shuttle mission to the International Space Station (ISS) flown by Space Shuttle Atlantis. It was the first human spaceflight launch...

Sextans is a faint, minor constellation on the celestial equator which was introduced in 1687 by Polish astronomer Johannes Hevelius. Its name is Latin...