If the universe is closed and finite, then
a. the universe will expand forever
b. the universe has a center
c. the universe has an edge
d. none of the above
Question 2The largest satellites of Jupiter are known as the ____________________ satellites.
Fill in the blank(s) with correct word
Question 3If the universe is closed, then its age will be
a. less than two-thirds of 1/H.
b. more than two-thirds of 1/H.
c. equal to 1/H.
d. equal to H squared.
e. equal to the square-root of H.
Question 4Why is Saturn oblate?
a. The gravity of its moons flattens the planet.
b. The rapid rotation of the planet flattens it.
c. It formed that way originally and has no way to reshape itself.
d. The magnetic fields of Jupiter and Saturn interact and cause the planet to flatten.
Question 5The universe is said to be closed if I. gravity is strong enough to stop the expansion in a finite time. II. the density of the universe is less than the critical density. III. the universe is finite.
a. I & II
b. I & III
c. II & III
d. I, I, & III
e. none of the above
Question 6What is one possible reasons Jupiter and Saturn radiate more energy than they receive from the sun?
a. Magnetic and electric fields heat the planet.
b. Fusion reactions of hydrogen into helium inside the planet provide an additional heat source.
c. The planets are still radiating heat from when they first formed.
d. Friction between the planet and its moons heat the planet.
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