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Global Warming_Notes_for_Test_Review[1]
Global Warming_Notes_for_Test_Review[1]

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PHS 111 Test 3 Review Chapters 26-28
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... The Sun tends to bloat outward by nuclear fusion, and contract due to: gravitation. nuclear fission. mass decrease. its relatively slow spin. reduced gaseous pressures. Each second, the burning Sun's mass: decreases. increases. remains unchanged. The age of the Sun is about 7000 years. 5.5 million y ...
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PHS 111 Test 3 Review Chapters 26-28

... The Sun tends to bloat outward by nuclear fusion, and contract due to: gravitation. nuclear fission. mass decrease. its relatively slow spin. reduced gaseous pressures. Each second, the burning Sun's mass: decreases. increases. remains unchanged. The age of the Sun is about 7000 years. 5.5 million y ...
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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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