This galaxy - ??0644-741 - is known as a ring-shaped galaxy that was formed as the result of a huge collision of galaxies. When galaxies collide, one of them goes through the other; isolated stars very seldom interact. The ring-shaped structure is formed as the result of gravitational perturbation when a small galaxy goes through a big one. When it happens, the interstellar gas and dust become dense, which entails a wave of star-formation that spreads from the contact point like waves on the surface of a pond. The small galaxy has already left the field of vision of this picture taken by the Hubble Telescope. AM 0644-741 is about 300 million of light years away. Explanation - in the picture we can see the death of a group of Mothers-planets that don't carry life with redistribution of energies going towards the Mothers-planets that are energetically weak.