One of the main causes of slow surface evolution is the:
A) depletion of ozone layer.
B) erosion due to moving air and water.
C) heat released from infalling matter.
D) heavy bombardment in the early Solar System.
B
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If the distance between two asteroids is doubled, the gravitational force they exert on each other will:
A) also be doubled. B) be half as great. C) be one fourth as great. D) be 1/16 as great. E) be four times greater.
What is the difference between a bound orbit and an unbound orbit around the Sun?
A) An object on a bound orbit follows the same path around the Sun over and over, while an object on an unbound orbit approaches the Sun just once and then never returns. B) An object on a bound orbit has a gravitational attraction to the Sun, while an object on an unbound orbit does not. C) A bound orbit is an orbit allowed by the universal law of gravitation, and an unbound orbit is not. D) A bound orbit is circular, while an unbound orbit is elliptical.
About where is our solar system located within the Milky Way Galaxy?
A) at the center of the galaxy B) about 10 percent of the way from the center of the galaxy to the outskirts of the galactic disk C) about half way from the center of the galaxy to the outskirts of the galactic disk D) near the far outskirts of the galactic disk E) in the halo of the galaxy above the galactic disk
The center of the galaxy has been studied extensively using visible light
a. True b. False Indicate whether the statement is true or false