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Galaxy cluster in the constellation Ursa Major
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.
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).
