[DIGEST: CNN, Space.com, Universe Today, NASA]

It has been one hundred years since Albert Einstein came up with his crowning intellectual achievement--the theory of relativity. That theory, published in 1915, posited that space and time are part of a single, interwoven continuum called spacetime. More importantly, spacetime itself is malleable and “warps” under the influence of matter. What we know as gravity is actually the bending of spacetime by objects with mass.

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