jan 1, 1915 - Theory of Relativity (1905-1915) Albert Einstein would redefine physics; he proposes mass and energy are equivalent. Gravity is the result of the warping of spacetime, predicts gravitational waves, & black holes. This theory was strengthened when it predicted Mercury's orbit, as previously mentioned.
Added to timeline:
Date:
jan 1, 1915
Now
~ 110 years ago