The theories of relativity by Albert Einstein revolutionized how the world thinks about space, time, mass, energy and gravity.
FULL STORY: General Relativity at 100: Einstein's Famous Theory Has Aged Well
Prior to Einstein, the laws of Isaac Newton were used to understand the physics of motion. In 1687, Newton wrote that gravity affects everything in the universe. The same force of gravity that pulled an apple down from a tree kept the Earth in motion around the sun.
But Newton never puzzled out the source of gravity.
Read more at Space.com
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