Exam 1: Cosmology and the Birth of the Earth

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In the context of scientific cosmology,the universe contains two basic entities: __________ and __________.

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A light year is a unit that measures

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__________ is the substance that makes up objects.

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Light from a star that has been shifted due to the Doppler effect is most likely to tell us the __________ of the star.

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Which of the following is true about blue-shifted light that we detect from the cosmos?

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Scientists have estimated the age of the Earth to be 4.57 Ga.What did they use to determine this age and why did they use it?

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Volatile materials can exist as gases at the Earth's surface.Which of the following is NOT a volatile material?

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Which of the following bodies is the smallest?

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Energy can best be described as

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Which of the following best describes how the Earth's Moon formed?

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What is a planet? List the three criteria that define a planet.Why is Pluto no longer considered a planet?

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Which of the following planets is MOST similar to Earth?

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Scientists believe that the Moon formed due to a protoplanet colliding with the Earth.If this is the case,the Moon should have a composition similar to

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The closest galaxy to ours is ________,which is 4.37 light years away.

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The terrestrial planets are also known as the

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The figure below represents the final stage in the Earth's formation,which is marked by all of the following EXCEPT The figure below represents the final stage in the Earth's formation,which is marked by all of the following EXCEPT

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Our Solar System belongs to a galaxy known as

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The best estimate of when the Universe formed is

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Currently,the most accurate ages of the Earth come from dating

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The primary evidence that our Sun is a third-,fourth-,or fifth-generation star comes from the fact that our

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