Most notable of the deep-sky objects in Corvus is NGC 4038-4039, the Ring-tail Galaxy, or the Antennae. A representative of the two percent of all known galaxies called peculiar galaxies, this object is formed by two interlocking structures. The stars involved in a collision of galaxies do not themselves collide, for they are separated by immense distances. However, in such a crash the atoms of the gas and dust clouds do collide, forming pockets of very dense material from which new stars are born. Hubble Space Telescope photos prove that the Antennae is an excellent laboratory for studying the formation of stars and star clusters since it is the nearest and youngest example of a pair of colliding galaxies.