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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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This stunning collision of two galaxies (UGC 4881) has been dubbed The Grasshopper. It has a bright curly tail containing a remarkable number of star clusters. The galaxies, located 500 million light-years away in the constellation Lynx, are thought to be halfway through a merger — the cores of the parent galaxies are still clearly separated, but their discs are overlapping.