The blast originated about 50,000 light-years away and was detected Dec. 27. A light-year is the distance light travels in a year, about 6 trillion miles (10 trillion kilometers).
“Had this happened within 10 light-years of us, it would have severely damaged our atmosphere and possibly have triggered a mass extinction,” said Bryan Gaensler of the Harvard-Smithsonian Center for Astrophysics (CfA).
Dang, as usual. I totally missed it. Definitely click on the link and read the whole story. It’s an interesting read in its entirety. What’s cool to think about IMO, is that something so far away could have an impact on Earth. The universe just gets smaller every day.