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Department of Physics

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Hubble Space Telescope image of the galaxy cluster Abell 2218. The mass density in the cluster is high enough to distort the images of background galaxies by gravitational lensing, forming multiple arc-like images seen here. See press release.

Udergraduate-level Reading

• The Physical Universe, Frank Shu
• An Introduction to Modern Astrophysics Bradley W. Carroll and Dale A. Ostlie Addison-Wesley Publishing Company, 1996