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Test #1
Test #1

... a) clockwise, b) counter clockwise, c) it doesn’t, d) vertical 2) Which planet orbits fastest around the Sun? a) Mercury, b) Venus, c) Earth, d) Jupiter 3) If the Earth were inclined more on its axis than it currently is, what would be the consequences? a) more drastic seasons, b) a longer year, c) ...
Unit I – The Size, Shape and Motion of the Earth
Unit I – The Size, Shape and Motion of the Earth

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Midterm Review -- Astronomy Unit

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15 Billion
15 Billion

... b. Computer models of planetary collisions create an Earth-Moon system like ours. The composition of the Moon matches the mantle. c. The age of large impact craters on the Earth match the age extinctions in the fossil record. d. In 1987, a supernova is observed creating heavy elements. e. 4.3 billio ...
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14. Galileo and the Telescope.

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File - Mr. Dudek`s Science

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... and all objects that are gravitationally bound to the sun. • The solar system is roughly divided into the inner planets (Mercury, Venus, Earth, and Mars) and the outer planets (Jupiter, Saturn, Uranus, and ...
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Movement of the Planets Shape of the Earth

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... • Greenhouse effect: Increases surface T (e.g., Venus, at 0.72 AU, is within HZ, but Ts~745 K!) • Lifetime of star: larger mass = shorter lifetime (must be long enough for evolution) • UV radiation emission: larger mass = more UV (deleterious to life… as we know it) • Habitable zone moves outward wi ...
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Answers to Science Semester 1Review Possible hazards in the lab

... 32. Planets that have retrograde rotation are: Venus, Uranus, and Pluto. 33. Rotation is the spinning or turning about an axis. 34. Planet’s rotation tells us the length of day. 35. Revolution is the motion of a body orbiting another body in space. 36. Planet’s revolution tells us the length of the ...
Astronomy I Ex.2
Astronomy I Ex.2

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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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