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14 of 14 from Photos: Hubble's newest visions of space
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The arcs and streaks in galaxy cluster Abell 370 reveal "gravitational lensing," the distortion of light from far-off, background galaxies by the cluster's gravitational field. The lensing effect helps astronomers measure the distribution of dark matter in galaxy clusters.
September 11, 2009 9:49 AM PDT
Photo by: NASA, ESA, and the Hubble SM4 ERO Team
