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Name:  george w mckenzie
Status: N/A
Age: N/A
Location: N/A
Country: N/A
Date: 1999


Question:
What causes gravity?


Replies:
Hmmm. Deep question. So far as I know the force of gravity is something that is observed, but nobody can say what the cause is. In other words, it is observed that by postulating a force of gravity, we can explain the attraction of different objects to one another and can compute orbits of the planets, satellites, etc.

Gravitational force is proportional to the masses of the two objects that are attracting each other, so that an object with twice the mass will attract with twice the force. The gravitational force also falls off as the square of the distance, so that an object that is twice as far away will attract with four times less force. These are postulations that Isaac Newton made which allowed him to accurately predict the movements of the planets and other physical phenomena, but is not an explanation for the cause of gravity.

(You might get a different answer if you try the physics section.)

-Grant



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