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Characteristics of Stars Stars Analyzing Starlight Star Characteristics
Characteristics of Stars Stars Analyzing Starlight Star Characteristics

... Analyzing Starlight ...
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... Agency, it was part of the Cassini–Huygens mission and became the first spacecraft to land on Titan. The probe was named after the Dutch 17th-century astronomer Christiaan Huygens who discovered Titan in 1655. The combined Cassini–Huygens spacecraft was launched from Earth on October 15, 1997. Huyge ...
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• Cassini set out to measure the distance of the Solar system. Recall

... • Cassini set out to measure the distance of the Solar system. Recall that all of the ratios of distances between the planets were known. Thus, once one distance was known the others could be determined. The closest planet is Mars and Cassini set out to measure this in 1672 • The method is based on ...
General exercise model answer Exercise 1 page 90 to 93 Question
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... b) the direction that planets orbit the Sun is opposite to the Sun’s spin. c) the terrestrial planets have higher density and lower mass. d) comets do not necessarily orbit in the plane of the solar system. Explanation: The planets do orbit in the same direction that the Sun spins. Most also spin in ...
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CK12- Study of Space by the EM Spectrum Student Name: ______
CK12- Study of Space by the EM Spectrum Student Name: ______

... Write a one sentence summary of the article that highlights the most important concepts. ...
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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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