 Here's a look at a pair of galaxies. NGC 4647 is the spiral galaxy in the upper right. M60 is the huge elliptical galaxy. On the edge of M60, there is an ultra-compact galaxy known as M60ucd1. New Hubble observations have found a supermassive black hole with a mass of 20 million suns at its center. M60ucd1 is a tiny galaxy with a diameter of only 300 light-years, containing some 140 million stars. This is 500 times smaller than the Milky Way, but its supermassive black hole is five times more massive than ours. This shows just how significant this black hole is, and it leaves open the question about just how a black hole is large could have been created in the first place given a small number of stars in its galaxy.