Image: Galaxy pair NGC 3504 and NGC 3512 (opens in new tab)

This striking pair of galaxies located 80 million light-years from Earth lies in the constellation Leo against a backdrop of distant galaxies. The barred spiral galaxy NGC 3504 is seen on the right, and the spiral galaxy NGC 3512 is on the left. Although the two galaxies are thought to be physically close to one another, no clear evidence of ongoing gravitational interaction has been found.