A ring in truth

Stephen Battersby

Nature, 1998, vol. 392, issue 6676, 548-548

Abstract: Gravity bends light. That is a prediction of Einstein's theory of general relativity, and observations bear it out — most obviously, in gravitational lenses, where a distant galaxy's image is stretched or multiplied, or both, by an intervening mass. In the latest lens to be discovered, the image forms a complete ring (an Einstein ring') around the lensing galaxy. With a large enough sample of lenses, one can set constraints on the geometry of the Universe.

Date: 1998
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DOI: 10.1038/33281

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