The Buzz of General Relativity

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Science  03 Sep 1999:
Vol. 285, Issue 5433, pp. 1499-1500
DOI: 10.1126/science.285.5433.1499

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Neutron stars and black holes have the strongest gravity, and hence--according to Einstein's general theory of relativity--curve space-time the tightest, of all known objects in the universe. Observations by NASA's Rossi X-ray Timing Explorer (RXTE) are now providing the first direct measurements of the orbital motion of matter in these strongly curved space-times. These observations provide insights into the fundamental properties not only of space-time but also of matter itself.