The powerful gravity of a galaxy embedded in a massive cluster of galaxies in this Hubble Space Telescope image is producing multiple images of a single distant supernova far behind it. Both the galaxy and the galaxy cluster are acting like a giant cosmic lens, bending and magnifying light from the supernova behind them, an effect called gravitational lensing.
NASA/ESA/S. Rodney (JHU) and the FrontierSN team; T. Treu (UCLA)/P. Kelly (UC Berkeley)/GLASS team/J. Lotz (STScI)/Frontier Fields team/M. Postman (STScI)/CLASH team/Z. Levay (STScI)