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Unmanned Space MissionUnmanned space missions are those using remote-controlled spacecraft. The first such mission was the Sputnik I mission, launched October 4, 1957. Some missions are more suitable for unmanned missions rather than manned space missions, due to lower cost and lower risk factors. Since the early 1970s, most unmanned space missions have been based on space probes with built-in mission computers, and as such may be classified as embedded systems. Most American unmanned missions have been coordinated by the Jet Propulsion Laboratory, and European missions by ESOC, part of ESA (the European Space Agency). ESA has conducted relatively few space exploration missions (one example is the Giotto mission, which encountered comet Halley). ESA has, however, launched various spacecraft to carry out astronomy, and is a collaborator with NASA on the Hubble Space Telescope. There has been a large number of very successful Russian space missions. There were also a few Japanese missions and the Chinese space program is preparing missions for the future. Unmanned programs through the ages (first mission year given, if known): Earth orbit and Lunar missions Early Earth-orbital missions Supply vessels Lunar exploration Solar System exploration - Venera program - Venus orbital and landing
- Vega program - Venus and Comet Halley
- Zond program - Moon, Venus, and Mars flyby
- Pioneer Venus project - Venus orbital and landing
- Mariner program - Mercury, Venus and Mars, flyby and orbital
- Pioneer program - Jupiter and Saturn flyby
- Voyager program - Jupiter, Saturn, Uranus and Neptune flyby
- Giotto mission - Flyby of Comet Halley (1986)
- Sakigake probe - Flyby of Comet Halley (1986)
- Suisei probe - Flyby of Comet Halley (1986)
- Galileo probe - Jupiter orbiter and "lander"
- Magellan probe - Venus orbiter
- Cassini-Huygens - Saturn orbiter and Titan lander Huygens; launched 1997
- NEAR Shoemaker - asteroid lander, launched 1996
- Deep Space 1 - comet/asteroid flyby, 1998-2000
- Stardust probe - comet flyby and sample return, launched 1999, expected return 2006
- CONTOUR - comet flyby mission; launch failure in 2003
- Hayabusa - asteroid orbiter, lander and sample return, launched 2003
- Rosetta - comet orbiter and lander (Philae); launched 2004
- MESSENGER - Mercury orbiter, launched 2004
- Dawn - Ceres and Vesta orbiter, to be launched in 2006
Mars Probes See also External links
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