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Newton's theory of gravity
Newton's theory of gravity assumed that space and time were fixed or absolute and that gravity was a force.Einstein showed that space and time were not absolute and that it can be distorted in the presence of a massive body like the earth and sun.
Einstein identified the property of spacetime which is responsible for gravity is its curvature. Space and time in Einstein's universe are no longer flat (as implicitly assumed by Newton) but can pushed and pulled, stretched and warped by matter. Gravity feels strongest where spacetime is most curved, and it vanishes where spacetime is flat. This is the core of Einstein's theory of general relativity, which is often summed up in words as follows: "matter tells spacetime how to curve, and curved spacetime tells matter how to move"
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