Located about 45 million light-years from Earth in the constellation Pisces, NGC 660 is a unique and peculiar polar-ring galaxy. Polar-ring galaxies are galaxies with outer rings of stars and gas passing through the polar regions. These rings passing through the polar regions are thought to have formed after an interaction between two galaxies. NGC 660 may have formed after a collision between two galaxies about a billion years ago, or it may have originally been a disk galaxy that captured material from another galaxy passing by, which may have been stretched into a rotating ring over time. The ring is not actually completely polar, but is tilted about 45 degrees to the plane of the parent disk. The large pink star-forming regions in the galaxy's ring may be the result of gravitational interactions caused by this collision. At 50,000 light-years in diameter, the ring is much wider than the disk itself and has more gas and star-forming activity than the parent disk. This may indicate a very violent origin. The polar ring contains hundreds of objects, many of which are red and blue supergiants. The most recently formed stars in the ring are about 7 million years old, suggesting that the formation of these stars was an ongoing, long-term process that is still ongoing.