Mayall's Object is the result of two colliding or interacting 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.

Distance to Earth: 450 million light years

Age: 12.85 billion years

Distance: 1.396731555 × 10^25′ 0″

Magnitude: 15

Constellation: Ursa Major

Did you know: 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.