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NASA photos: The Hubble is back

By: Catie Leary on Oct. 16, 2009, 11:23 p.m.
NASA photos from the Hubble Space Telescope show gravitational lensing in galaxy cluster Abell 370

Photo: NASA, ESA, Hubble SM4 ERO Team, and ST-ECF

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Gravitational lensing in galaxy cluster Abell 370

When astronomers discovered the phenomenon of gravitational lensing, Abell 370 was one of the first galaxy clusters to be observed. Gravitational lensing is an important tool for astronomers to measure the distribution of dark matter in massive clusters.