If the moon were twice as far from earth as it now , which of the following would be true?
a . earth's gravitational pull on the moon would be the same as it is now because distance does not affect earth's gravity.
b . the gravitational pull would be zero.
c . the gravitational pull between the moon and earth would decrease because the distance between the moon and earth would have increased.
d . the gravitational pull between the moon and earth would be the same because their masses has not changed.