BDF-521 is a distant galaxy with a redshift of z = 7.008, corresponding to a distance traveled by light to come down to Earth of 12.89 billion light years.
References
^Vanzella, E.; Pentericci, L.; Fontana, A.; Grazian, A.; Castellano, M.; Boutsia, K.; Cristiani, S.; Dickinson, M.; Gallozzi, S.; Giallongo, E.; Giavalisco, M.; Maiolino, R.; Moorwood, A.; Paris, D.; Santini, P. (2011). "Spectroscopic Confirmation of Two Lyman Break Galaxies at Redshift Beyond 7". The Astrophysical Journal. 730 (2): L35. arXiv:1011.5500. Bibcode:2011ApJ...730L..35V. doi:10.1088/2041-8205/730/2/L35.
