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galaxy cluster SDSS J1038+4849

 vu par Hubble Wide Field and Planetary Camera 2 (WFPC2) and Wide Field Camera 3 (WFC3)

In the case of this “happy face”, the two eyes are very bright galaxies and the misleading smile lines are actually arcs caused by an effect known as strong gravitational lensing.

http://www.nasa.gov/content/hubble-sees-a-smiling-lens/#.VNo1Pi4XGDk