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Science 17 August 2001:
Vol. 293. no. 5533, pp. 1234 - 1235
DOI: 10.1126/science.293.5533.1234b
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News of the Week

ASTRONOMY:
Pull of Gravity Reveals Unseen Galaxy Cluster

Andrew Watson

Astronomers have discovered a whole new cluster of galaxies and calculated its distance, without relying on its emitted light. Instead they inferred the unseen cluster's existence from the way its gravity rerouted light from more-distant galaxies beyond. The work is the first to show that the technique, known as gravitational lensing, can be used to map matter in deep space.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)