Deepest galaxy cluster ever pictured by Hubble

The "deepest ever" image of a group of galaxies - "Pandora's Cluster" - has been captured by the Hubble Space Telescope. The blue arcs in the picture are distant galaxies as they appeared 12 billion years ago - not long after the Big Bang. via Pocket http://www.bbc.co.uk/news/science-environment-25648219