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A ring in truth

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  • Stephen Battersby

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.

Suggested Citation

  • Stephen Battersby, 1998. "A ring in truth," Nature, Nature, vol. 392(6676), pages 548-548, April.
    • Handle: RePEc:nat:nature:v:392:y:1998:i:6676:d:10.1038_33281
    DOI: 10.1038/33281
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