Allows one to calculate the force of gravity acting on a variety of masses over a range of distances.
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What really is gravity? How is this force able to act across the vastness of empty space? And why does it exist in the first place? Science has never been very successful in answering these most basic questions about nature. Gravity cannot somehow slowly arise by mutation or natural selection. It was present from the very beginning of the universe. Along with every other physical law, gravity is surely a testimony to a planned creation.