The universe suddenly looks a lot more crowded, thanks to a deep-sky census assembled from surveys taken by the Hubble Space Telescope and other observatories. One of the most fundamental questions in astronomy is: "How many galaxies does the universe contain." The landmark Hubble Deep Field, taken in the mid-1990s, gave the first real insight into the universe's galaxy population. Subsequent sensitive observations such as Hubble's Ultra Deep Field revealed a myriad of even more faint galaxies. This led to an estimate that the observable universe contained about 200 billion galaxies. The new research shows that this estimate is too low and comes to the staggering conclusion that at least 10 times more galaxies exist in the observable universe than astronomers thought.