One light-year:
12.9 Gly(109ly/1Gly) = 12.9 × 109 ly
Distances in space are often quoted in units of light years, the distance light travels in one year.
In June 2012, the Subaru Telescope in Hawaii discovered one of the farthest galaxies ever seen. Named SXDF-NB1006-2, it is around 12.9 Gly from Earth. How far away is this galaxy in meters?
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