Ring Galaxy NGC 922 was formed by the collision of two galaxies which triggered the formation of new stars in shape of a ring. Some of these were massive stars that evolved and collapsed to form black holes. (NASA, Chandra, 12/05/12) by NASA's Marshall Space Flight Center
A beautiful new image of two colliding galaxies has been released by NASA's Great Observatories. The Antennae galaxies, located about 62 million light-years from Earth, are shown in this composite image from the Chandra X-ray Observatory (blue), the Hubble Space Telescope (gold and brown), and the Spitzer Space Telescope (red).