Not quite billions of light-years, but here's another example: >Modern astronomers now consider its distance from Earth to be about 7,200 light-years or 2,200

Not quite billions of light-years, but here's another example: >Modern astronomers now consider its distance from Earth to be about 7,200 light-years or 2,200 parsecs. >SN 1006 lies well beyond 1 kiloparsec, and it did not appear to have significant effects on Earth. However, a signal of its outburst can be found in nitrate deposits in Antarctic ice. https://en.wikipedia.org/wiki/SN_1006 https://en.wikipedia.org/wiki/SN_1006 (discussion: https://news.ycombinator.com/item?id=37783654 https://news.ycombinator.com/item?id=37783654)