The gravitational force of the moon is one ten-millionth that of earth, but when you combine other forces such as the earth's centrifugal force created by its spin, you get tides. The sun's gravitational force on the earth is only 46 percent that of the moon.
If you were doing a block of text you would normally do double spacing and in this case, using same margins and same font you would get an average of 480 words, but with normal text the norm is usually around 300 words to a page. Not enough parameters to answer.
While there is no official page limit, a good guideline is two double-spaced pages, using readable fonts and margins. Your personal statement/essay should be a clear and concise example of your best writing. It should also be free from spelling and grammatical errors.