Spaceflight
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Spaceflight
Spaceflight (pronounced: /ˈspeɪsflaɪt/) is the process of using various types of spacecraft to travel beyond Earth's atmosphere. This term encompasses both manned and unmanned missions.
Etymology
The term "spaceflight" is derived from the English words "space" and "flight". "Space" originates from the Old French espace, meaning "room, area, distance", while "flight" comes from the Old English flyht, meaning "act of flying".
Related Terms
- Astronaut: A person who is trained to travel in a spacecraft. The term astronaut comes from the Greek words astron, meaning "star", and nautes, meaning "sailor".
- Orbit: The gravitationally curved trajectory of an object, such as the trajectory of a spacecraft around a planet.
- Satellite: An object in space that orbits or circles around a bigger object. There are two kinds of satellites: natural (like the moon orbiting the Earth) and man-made (like the International Space Station, or ISS).
- Rocket: A vehicle, missile, or aircraft that obtains thrust by the reaction to the ejection of fast-moving exhaust from within a rocket engine.
- Spacecraft: A vehicle designed for travel or operation in outer space.
- Space Station: A large spacecraft that remains in low Earth orbit for extended periods of time. It is a home where astronauts live and work.
- Space Shuttle: A reusable low Earth orbital spacecraft system that was operated from 1981 to 2011 by the U.S. National Aeronautics and Space Administration (NASA).
- Space Exploration: The ongoing discovery and exploration of celestial structures in outer space by means of continuously evolving and growing space technology.
- Space Mission: An assignment carried out by a spacecraft, which could involve going to the moon, other planets, or just orbiting the Earth.
- Extravehicular Activity (EVA): Any activity done by an astronaut or cosmonaut outside a spacecraft beyond the Earth's appreciable atmosphere.
External links
- Medical encyclopedia article on Spaceflight
- Wikipedia's article - Spaceflight
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