Hubble's newly repaired Advanced Camera for Surveys has peered nearly 5bn light-years away to resolve intricate details in the galaxy cluster Abell 370. This was one of the first galaxy clusters in which astronomers observed 'gravitational lensing', where the warping of space by the cluster’s gravitational field distorts the light from galaxies lying far behind it. This is seen as arcs and streaks in the picture – the stretched images of more distant galaxies

Photograph: Nasa/Esa