21st Century Astronomy (fifth Edition)
21st Century Astronomy (fifth Edition)
5th Edition
ISBN: 9780393603330
Author: Laura Kay, Stacy Palen, George Blumenthal
Publisher: W. W. Norton & Company
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Chapter 12.1, Problem 12.1CYU
To determine

The reason for the celestial bodies to be called as the dwarf planets even they are smaller than the several moons.

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Imagine that astronomers have just discovered a planet orbiting another star (other than the Sun), and they have reported the mass of the planet as 4.2 Jupiter-masses. Explain in a few words what this means.
What would be the angular diameter (in arc seconds) of a planet with diameter 8.5 x 105 km and orbital distance from it's star of 175 x 108 km as seen from a planet with. orbital distance from the same star of 70 x 107 km as seen from their closest approach?
You're on your way from Earth to Neptune, and you're 50 million kilometers from Earth.  Then at the moment you are orbiting     the enter of the Earth     the center of the Sun     the center of Neptune
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