News of the WeekAstronomy

Pull of Gravity Reveals Unseen Galaxy Cluster

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Science  17 Aug 2001:
Vol. 293, Issue 5533, pp. 1234-1235
DOI: 10.1126/science.293.5533.1234b

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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.