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Earth has formed in our solar system
Earth has formed in our solar system

... because of cooling • Hence location is important for planetary composition (planets closer to the sun should be more refractory) • Interaction of large body at final stages could change composition considerably ...
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Review Astronomy - Cowley`s Earth Systems

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... dressed entirely in black. When asked if he finds it’s a little hot to be dressed in black he replies: “As a matter of fact, black is an excellent color for heat. If you remember your blackbody radiation, black is actually best in heat. Efficient radiation.” Briefly describe why the mathematician, a ...
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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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