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DO PHYSICS ONLINE SPACE MOTION OF SATELLITES
DO PHYSICS ONLINE SPACE MOTION OF SATELLITES

... exception of the lunar flights of the Apollo program, all human spaceflights have taken place in LEO. The altitude record for a human spaceflight in LEO was Gemini 11 with an apogee of 1,374.1 km. All manned space stations and the majority of artificial satellites, have been in LEO. Orbital decay is ...
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The Reflector: January 2010 - Peterborough Astronomical Association

... France. It was a pleasure to have had them join our club for even part of this year. We are so glad that Gabriel’s dad not only had the opportunity to work at Trent University, but that he decided to bring Gabriel out to join. In the short time he was with us, Gabriel was taking off as a budding ast ...
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Extraterrestrial life



Extraterrestrial life is life that does not originate from Earth. It is also called alien life, or, if it is a sentient and/or relatively complex individual, an ""extraterrestrial"" or ""alien"" (or, to avoid confusion with the legal sense of ""alien"", a ""space alien""). These as-yet-hypothetical life forms range from simple bacteria-like organisms to beings with civilizations far more advanced than humanity. Although many scientists expect extraterrestrial life to exist, so far no unambiguous evidence for its existence exists.The science of extraterrestrial life is known as exobiology. The science of astrobiology also considers life on Earth as well, and in the broader astronomical context. Meteorites that have fallen to Earth have sometimes been examined for signs of microscopic extraterrestrial life. Since the mid-20th century, there has been an ongoing search for signs of extraterrestrial intelligence, from radios used to detect possible extraterrestrial signals, to telescopes used to search for potentially habitable extrasolar planets. It has also played a major role in works of science fiction. Over the years, science fiction works, especially Hollywood's involvement, has increased the public's interest in the possibility of extraterrestrial life. Some encourage aggressive methods to try to get in contact with life in outer space, whereas others argue that it might be dangerous to actively call attention to Earth.
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