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Science  09 Oct 1998:
Vol. 282, Issue 5387, pp. 195e
DOI: 10.1126/science.282.5387.195e

Einstein's theory of general relativity forced physicists to grapple with this fundamental question: Since the space-time continuum is itself changing, how do you define energy and momentum? In this week's Enhanced Perspective (p. 249), Matt Visser explains a recent paper that at last offers a proper definition of angular momentum, which is carried by rotating objects like stars and black holes. Hyperlinks point to info about general relativity, astrophysics, and fundamental physics.

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