Universe
Universe
11th Edition
ISBN: 9781319039448
Author: Robert Geller, Roger Freedman, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 11, Problem 62Q
To determine

The reasons for Phobos and Deimos not being round in shape like the Moon.

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Although Deimos is smaller than Phobos, Deimos has more debris on its surface. This difference in the two moons is probably the result of   a. the greater number of impact craters on Deimos.   b. Martian gravity, which is strong enough to pull debris off the surface of Phobos.   c. the lack of volcanic activity on the surface of Phobos.   d. the comparatively weaker gravity on Deimos.   e. the slower rotation rate of Deimos on its axis.
What is the angular diameter of Saturn (in degrees) as seen from the surface of Dione?   Note: Necessary data can be found in this Celestial Profile and in this table. Hint: Use the small-angle formula, angular diameter (in arc seconds) 2.06 ✕ 105  =  linear diameter distance
Enceladus is a moon of Saturn. What unique feature does it possess? which is the correct answer?     Cryovolcanism, where water erupts instead of silicate rock     A dense system of rings     An atmosphere thicker than Earth's     Internal heating due to radioactivity     Has an orbit inside Saturn's rings

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