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.
Question 2
What do we mean when we say that the universe is expanding?
A) Average distances between galaxies are increasing with time.
B) Within galaxies, average distances between star systems are increasing with time.
C) Everything in the universe is gradually growing in size.
D) The statement is not meant to be literal; rather, it means that our knowledge of the universe is growing.
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