Hubble observes shapes of more than 7000 faint background galaxies
Five days of observations produced altogether the 39 Hubble Wide Field and Planetary Camera 2(WFPC2) images required to map the mass of the galaxy cluster CL0024+1654.
Credit: European Space Agency, NASA and Jean-Paul Kneib (Observatoire Midi-Pyrenees, France/Caltech, USA)