A typical galaxy is a
A) collection of millions or billions of stars, bound together by gravity and orbiting a common center.
B) large, glowing ball of gas powered by nuclear energy.
C) nearby object orbiting a planet.
D) relatively small, icy object orbiting a star.
E) system consisting of one or a few stars orbited by planets, moons, and smaller objects.
A) collection of millions or billions of stars, bound together by gravity and orbiting a common center.
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To avoid confusion, cosmologists use the term ice to mean only frozen water; other frozen gases are called plasma.
a. true b. false
Star A has an apparent magnitude = 3 and star B has an apparent magnitude = 5. Which star is brighter in our sky?
A) Star A B) Star B C) There is not enough information to answer the question. D) The two stars have the same brightness in our sky, but Star A is closer to us than Star B.
An asteroid revolves around the Sun with a perihelion 0.5 AU and an aphelion of 7.5 AU. What is its period of revolution?
a. 4 years b. 8 years c. 16 years d. 32 years e. 64 years
Many of Saturn's outer smaller moons, like Phoebe, orbit ________ compared to the planet's rotation
Fill in the blank(s) with correct word