The densest galaxy in the nearby universe may have been found. This galaxy weighs more than 200 million Suns, over half of which is concentrated within a radius of just 80 light-years. The density of stars in that region is 15,000 times greater than found in Earth's neighborhood in the Milky Way. Chandra, Hubble, and ground-based telescopes were used to discover and study this galaxy.
X-ray: NASA/CXC/MSU/J.Strader et al, Optical: NASA/STScI