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(1) Why is the Pleiades star cluster visible all night around
(1) Why is the Pleiades star cluster visible all night around

Mod three revision
Mod three revision

... • mercury has been known since least the time of the Sumerians (3rd million bc) • the greeks gave mercury two • names,hermes as an evening star,Apollo for its morning star ...
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Astronomy Assignment #5: Newton`s Universal Law of Gravitation

... If the Earth was 3 A.U. from the Sun (instead of 1 A.U.), would the gravity force between the Earth and the Sun be less or more than it is now? By how many times? If Mercury was 0.2 A.U. from the Sun (instead of 0.4 A.U.), would the gravity force between Mercury and the Sun be less or more than it i ...
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Early Observers (The Beginnings of Astronomy)

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Note: Bring the solved worksheet on Sunday, 21 st February 2016

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Sidereal and Solar Time

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Chapter 19 I. The Sun, Earth and Moon A. Sun is our closest star B

... II. During this process small celestial bodies also formed A. Comets- long tails and icy centers 1. orbits around Sun usually very long B. Asteroids- made from different elements C. Meteorites- sometimes strike the Earth Chapter 20 I. The Life and Death of Stars A. What are stars? 1. Stars are huge ...
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Chapter 1 - Humble ISD

... • Earth is between __________________________ • Partial when only part of Moon is in shadow • Total when it all is in shadow • Solar eclipse: Moon is between ________________________ • Partial when only part of Sun is blocked • Total when it all is blocked • Annular when Moon is too far from Earth f ...
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STUDY GUIDE Multiple Choice Identify the choice that best

... Why was Wegener’s hypothesis of continental drift originally rejected by geologists? a. Wegener did not have any data to support his hypothesis. b. The continents of South America and Africa do not fit well together. c. Wegener could not explain how the continents could move through the ocean floor. ...
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Integrative Studies 410 Our Place in the Universe

Midterm Review Sheet
Midterm Review Sheet

... Earth’s  structure  –  know  the  different  layers,  with  emphasis  on  lithosphere   Differentiation   Sources  of  central  heat  in  planets   Convection  (including  conditions  required  for  convection)   Earth’s  magnetic  field   Magnet ...
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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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