Mayall's Object (also classified under the Atlas of Peculiar Galaxies as Arp 148) is the result of two colliding galaxies located 500 million light years away within the constellation of Ursa Major.

It was discovered by American astronomer Nicholas U. Mayall of the Lick Observatory on 13 March 1940, using the Crossley reflector.

[4] When first discovered, Mayall's Object was described as a peculiar nebula, shaped like a question mark.

It is thought that the collision between the two galaxies created a shockwave that initially drew matter into the center which then formed the ring.

[6] Arp 148 was imaged by the Hubble Space Telescope as part of a survey of what are thought to be colliding galaxies.