relativity

Belgian cosmologist and Catholic priest Georges Lemaitre made that connection by realizing that the theory of general relativity described an expanding universe.

Wheeler also worked closely with Albert Einstein, helping center his theory of general relativity.

For the northern hemisphere - including the UK - viewing may be challenging do to the comet's relativity to the Sun.

Then, Albert Einstein solved the tension by coming up with the theory of relativity, which explains how massive objects cause distortions in spacetime.

Its last major revolutions -- quantum mechanics and general relativity -- are a century old.