Stars and Galaxies
9th Edition
ISBN: 9781305120785
Author: Michael A. Seeds, Dana Backman
Publisher: Cengage Learning
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Which planetary model allows a scientist to predict the exact positions of the planets in the night sky over many years?
Suppose, hypothetically, that the Earth orbited the Sun at half its current distance. (That is, at 1/2 AU instead of 1 AU). What would be the length of the year? What else would be different?
Earth’s mass is 6 x 1024 kg and it is located 150 million kilometers from the Sun.
Calculate the speed of Earth’s orbital motion in [km/s].
(1 year = 365.25 days)
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