This image, obtained by the Hubble Space Telescope on 27–28 October 2008, shows a pair of gravitationally interacting galaxies called Arp 147. It is the first picture obtained after Hubble science operations were resumed on 25 October, four weeks after a problem with the science data formatter took the spacecraft into safe mode. The sharpness of the galaxies 400 million light-years away demonstrates that the famous spacecraft is doing well. The passage of the galaxy on the left through the one on the right created a circular compression wave that triggered intense star formation, thus resulting in a characteristic blue ring (CERN Courier June 2004 p15; March 2006 p12; June 2008 p12). The dusty reddish knot on the ring is probably the original nucleus of the galaxy that was hit.