Albert Einstein’s theory of general relativity has held up pretty well after a century out in the world.

The famous theory, which Einstein published in 1915, remains the bedrock upon which scientists’ understanding of the origin and evolution of the universe rests. It continues to inspire research into some of the most fundamental unanswered questions in physics and astronomy.

General relativity “is now, I think, routinely accepted as the foundation of our description of the universe at large, which we call cosmology; of black holes, of neutron stars and of small corrections to the orbits of planets and spacecraft in our own solar system,” said Roger Blandford of the Kavli Institute for Particle Astrophysics and Cosmology at Stanford University.
http://www.space.com/28741-einstein-general-relativity-100-years.html

Einstein’s Theory of Relativity Explained (Infographic)
http://www.space.com/28738-einstein-theory-of-relativity-explained-infgraphic.html

Graphic by The Misty Miss Christy based on http://archives-dc.library.caltech.edu/islandora/object/ct1%3A439