SDSS J1038+4849 is a galaxy cluster 4.5 billion light-years away in the constellation Ursa Major, famous for its appearance as a smiley face. The yellow eyes and white nose are distant galaxies, while the smile and border are caused by gravitational lensing.[1] [2]

References

  1. ^ "Hubble Sees a Smiling Lens - NASA Science". science.nasa.gov.
  2. ^ Wiesner, M. P. (2010). On the properties of ten strong-lensing systems found in the Sloan Digital Sky Survey (Master's thesis, Northern Illinois University).
Allikas: https://en.wikipedia.org/wiki/SDSS_J1038%2B4849
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