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Educational Resources for Astronomy 101 is a collection of digital resources for college-level introductory astronomy faculty and students. Astronomy Center is brought to you by the American Astronomical Society, the American Association of Physics Teachers, and the NSF-NSDL. Please register and start contributing today!

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When Galaxies Collide: Arp 148

When Galaxies Collide: Arp 148

Arp 148, nicknamed Mayall's object, is the aftermath of an encounter between two galaxies, resulting in a ring-shaped galaxy and a long-tailed companion. The collision between the two parent galaxies produced a shockwave effect that first drew matter into the center and then caused it to propagate outwards in a ring. Arp 148 is located in the constellation of Ursa Major, the Great Bear, approximately 500 million light-years away.

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