... The Coma Cluster of Galaxies . ... Each of these galaxies houses billions of stars - just as our own Milky Way Galaxy does. ... Deep inside Centaurus A, the closest active galaxy to Earth, lies ... another galaxy! ... EUVE Sky Map . ... The stars beyond the Sun and the distant galaxies should be undetectable at extreme ultraviolet wavelengths. ... The result, shown above, is the most complete sky map of the most common visible light emitted from the most abundant element in our Galaxy: hydrogen. ...