Over the years,the Hubble Space Telescope has astonished us over and again. It has shown us planets, moons, or star clusters,nebulae, galaxies… so many spectacular, or gorgeous and scientifically rich images that astronomers will investigate them for decades to reach.
Of all the kinds of observations it's taken,one of the most profound is also one of the most subtle. It hangs on a simple plan: What if we point this powerful observatory at one small spot in space, someplace that appears relatively empty, or let it just accumulate light for hours,days, weeks? What will we see?
Source: blastr.com