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Bugs 6 Photocop section 3-4.qxd
Bugs 6 Photocop section 3-4.qxd

... © Elisenda Papiol and Maria Toth 2005. Bugs 6. Published by Macmillan Publishers Limited. ...
Astronomy Humble ISD Curriculum Year-At-A
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Planets With Detectable Life - International Space Science Institute

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Astronomy 170: Aug. 24 10am class
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Conversations with the Earth

... • These Sun-like, habitable stars have just the right distance, constancy, and temperature to qualify in a forthcoming enlarged radio search. ...
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Chapter 5 and 6 Study Guide

... 6. When a ___hurricane___________________ moves from the ocean onto land, its strong winds and heavy rains can cause severe damage. 7. A hot, glowing ball of gases is a ___star____________. 8. To _revolve___________ means to move around another object. 9. The moon has eight main _phases_____________ ...
Life in the Universe
Life in the Universe

... 1. Old enough to allow time for evolution (rules out high-mass stars ~1%) 2. Need to have stable orbits (might rule out binary/multiple star systems ~50%) 3. Size of habitable zone: region where a planet of the right size could support liquid water ...
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Rare Earth hypothesis



In planetary astronomy and astrobiology, the Rare Earth Hypothesis argues that the origin of life and the evolution of biological complexity such as sexually reproducing, multicellular organisms on Earth (and, subsequently, human intelligence) required an improbable combination of astrophysical and geological events and circumstances. The hypothesis argues that complex extraterrestrial life is a very improbable phenomenon and likely to be extremely rare. The term ""Rare Earth"" originates from Rare Earth: Why Complex Life Is Uncommon in the Universe (2000), a book by Peter Ward, a geologist and paleontologist, and Donald E. Brownlee, an astronomer and astrobiologist, both faculty members at the University of Washington.An alternative view point was argued by Carl Sagan and Frank Drake, among others. It holds that Earth is a typical rocky planet in a typical planetary system, located in a non-exceptional region of a common barred-spiral galaxy. Given the principle of mediocrity (also called the Copernican principle), it is probable that the universe teems with complex life. Ward and Brownlee argue to the contrary: that planets, planetary systems, and galactic regions that are as friendly to complex life as are the Earth, the Solar System, and our region of the Milky Way are very rare.
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