Department of Physics and Astronomy, University of Rochester, Slide 52
The prediction of black holes.
¥Einstein tried to modify
his theory by adding a constant such that it would not predict the existence of
black holes. This constant became
known as the cosmological constant and accounted for all missing physics in the
theory.
¥Eventually
Einstein gave up; there appeared to be no need for the cosmological constant,
and Einstein called it "his greatest blunder".