The Hubble Space Telescope accumulated approximately 555 hours of exposure time to capture this Hubble eXtreme Deep Field image. The area shown represents a seemingly empty patch of sky about the width of a toothpick when held at arm's length. The picture contains only two foreground stars (indicated by surrounding spikes). Every other object is a galaxy. The most distant galaxies' light is reddened by the expansion of the universe. We're seeing light that left them 13.2 billion years ago.
An undated handout picture by NASA/ESA shows around 5,500 galaxies seen through the Hubble telescope. The time exposure titled 'Hubble extreme Deep Field' (XDF reveals galaxies up to 13.2 billion light-years from earth. Photo: NASA/ESA/G. Illingworth/D. Magee/P. Oesch/R. Bouwens/HUDF09 Team via @AOL_Lifestyle Read more: http://www.aol.com/article/news/2016/10/14/astronomers-may-now-fully-understand-why-the-sky-is-dark-at-nigh/21582286/?a_dgi=aolshare_pinterest#fullscreen