I found this at http://www.howstuffworks.com/
". Newton was the first person to study gravity seriously, and he came up with the law of universal gravitation:
Each particle of matter attracts every other particle with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between them...
Einstein later came along and redefined gravity, so there are now two models -- Newtonian and Einsteinian. Einsteinian gravitational theory has features that allow it to predict the motion of light around very massive objects and several other interesting phenomena...
The general theory of relativity addresses the problem of gravity and that of nonuniform, or accelerated, motion. .. Einstein's equations handle Newtonian gravity as a subset...
The question of why atoms attract one another is still not understood. The goal is to combine gravity, electromagnetism and strong and weak nuclear forces into a single unified theory."
They also had a related article called "Does Gravity Travel At The Speed Of Light?" Funny stuff, huh?
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