relativity

Ordinary matter -- planets, stars and galaxies -- falls into them according to established physical principles that include Einstein's general relativity and Euler's equations.

Einstein's theory of relativity replaced that classical model, and quantum mechanics transformed it yet again.

For over a century, Einstein's general theory of relativity has been the foundation of our understanding of space and time.

And general relativity presents a four-dimensional continuum that bends and curves -- we tend to imagine that continuum of the events as really existing.

These twin mergers not only provide fresh insight into how black holes form and evolve but also confirm, with unmatched precision, the predictions of Albert Einstein's general theory of relativity.