Exam1 - 1 What is an Astronomical Unit*13 What is a...

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1.) What is an Astronomical Unit? ***13) What is a circumpolar star? A) a star that is visible from the Arctic or Antarctic circles B) a star that is close to the south celestial pole C) a star that is close to the north celestial pole D) a star that makes a daily circle around the celestial sphere E) a star that always remains above your horizon . ****19) Why do we have seasons on Earth? A) As the earth goes around the Sun and the earth's axis remains pointed toward Polaris, the Northern and Southern hemispheres alternately receive more and less direct sunlight. B) The tilt of the earth's axis constantly changes between 0 and 23 1/2degree, giving us summer when the earth is tilted more and winter when it is straight up. C) Seasons are caused by the influence of the planet Jupiter on our orbit. D) The earth's distance from the Sun varies, so that it is summer when we are closer to the Sun and winter when we are farther from the Sun. 11)
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Exam1 - 1 What is an Astronomical Unit*13 What is a...

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