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Third Nine Weeks Review – Sky Patterns
Third Nine Weeks Review – Sky Patterns

...  Order of the planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune  All planets orbit around the sun.  Inner Planets – the planets that are closets to the sun (Mercury, Venus, Earth, and Mars)—they are small and rocky  Outer Planets – these planets are farther away from the sun ...
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... When he knew how far away a galaxy was he looked at the red shift. When he knew the red shift he could calculate the velocity of the galaxy. He found a correlation between the distance from Earth and the velocity of the galaxy. When he knew how far away the galaxies are and how fast they move, he co ...
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astronomy study guide

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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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