Widest, deep starfield ever, using infrared light! poster

Galaxies, Stars and Nebulae series A poster print showing the widest deep view of the sky ever made to date, using infrared light and ESO's VISTA telescope. This particular image comes from the UltraVISTA survey and reveals more than 200 000 galaxies. To make it, ESO’s VISTA telescope was trained on the same patch of sky repeatedly to slowly accumulate the very dim light of the most distant galaxies. In total more than six thousand separate exposures with a total effective exposure time of 55 hours, taken through five different coloured filters, were combined to create this picture. Apart from a handful of blue-looking stars, everything in this picture is a galaxy, billions of light years away. The tiny red dots are galaxies so remote that the light we see from them started its journey shortly after the Universe itself formed - wow! Reproduced under the Creative Commons Attribution 3.0 Unported license.