A ring galaxy is a
galaxy with a ring-like appearance. The ring consists of massive, relatively young blue
stars, which are extremely bright. The central region contains relatively little luminous
matter.
Astronomers believe that ring galaxies are formed when a smaller galaxy passes through the center of a larger galaxy. Because most of a galaxy consists of empty space, this "collision" rarely results in any actual collisions between stars. However the
gravitational disruptions caused by such an event could cause a
wave of star formation to move through the larger galaxy.
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A rare type of galaxy which is thought to have come into being after a compact galaxy has passed right through the centre of a normal
spiral galaxy . This encounter will have caused a shock wave, which will pass outwards in a concentric circle and triggered star formation, by compressing the interstellar medium, in its path. These newly formed stars shine in a ring.
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