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out of this world crossword
out of this world crossword

... 9. In 1969, Neil Armstrong became the first _ _ _ _ _ _ _ _ _ to set foot on the moon. ...
Brobo_solarsystem_faceoff
Brobo_solarsystem_faceoff

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Solar System Notes
Solar System Notes

... Our sun provides light and heat for earth Our sun is a star When the sun rises and sets it looks like it is moving but it is not actually moving E.Q. Why is the sun the most important object in our solar system? Seasons: Are caused by the Earth revolving around the sun and the tilt of the earth on i ...
UNIT 4 STUDY GUIDE Objectives
UNIT 4 STUDY GUIDE Objectives

... The force of gravity depends on what two factors? What two factors keep moons and planets in orbit? What causes the phases of the moon? What are the eight phases of the moon? Sketch each one. What is an eclipse? What are the two types of eclipses? What causes each one? What is the difference between ...
Outer space is no disgrace
Outer space is no disgrace

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THE MEDIEVAL ARISTOTELIAN WORLD VIEW Some

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NOTES April 21, 2008 Earth Science – 6th Grade Mrs. Elliott
NOTES April 21, 2008 Earth Science – 6th Grade Mrs. Elliott

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The Sky from Earth

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Name: Date: Period: ______ Unit 9

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Astronomy Unit Study Guide

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Astronomy Study Guide axis - A real or imaginary line through the

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Objective 10 Study Guide

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Review Handout - Sturgeon Moodle

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Astronomy Test Review

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... Mercury closest planet to the sun, it takes 59 days to make one rotation but only 88 days to orbit the Sun. That means that there are fewer than 2 days in a year! Venus is the brightest planet in our sky. It is called Earth’s sister planet because it is a similar size. Venus is hotter than Mercury ...
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Chapter 7 Solar System study guide
Chapter 7 Solar System study guide

... Sun – made of hydrogen and helium Sun is a star – it is the largest object in the S.S. 1,000,000 Earths Photosphere  Chromosphere  Corona (inside outside) Sunspots are cooler spots on the sun – they tend to look black. Sunspots come and go in cycles of about 11 years. Solar flares – explosion/ribb ...
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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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