The World Around Us

Einstein's theory of general relativity.  a high-precision test of Einstein's general relativity involving  the Cassini space probe.

Artist’s impression of an experiment sending radio waves from Earth to the Cassini satellite and back again in 2003. The deflection by the Sun confirmed the predictions of Einstein’s theory of general relativity to an accuracy of 20 parts in a million.

Credit: NASA/JPL-Caltech) The Life of Stars