A smiling lense: Two faint galaxies appear to be smiling in this Hubble image. The two orange 'eyes' are actually far away galaxies and the 'smile' lines are caused by an effect known as strong gravitational lensing. This happens when massive structures in the Universe exert such a powerful gravitational pull that they can warp the spacetime around them and act as cosmic lenses which can magnify, distort and bend the light behind them