ASTROPHYSICS:
X-ray Flickers Reveal a Space Warp
David Kestenbaum
X-ray signals from a distant neutron star have offered the first strong proof of Einstein's prediction that a very dense body, such as a black hole or a neutron star, bends space so steeply that objects orbiting closer than a certain point would slide catastrophically inward. The findings, presented at a meeting of the American Physical Society in Columbus, Ohio, last week, also offer new clues to the workings of these x-ray beacons.