Brightest Galactic Flash Ever Detected Hits Earth
`A huge explosion halfway across the galaxy packed so much power it briefly altered Earth’s upper atmosphere in December, astronomers said Friday.
No known eruption beyond our solar system has ever appeared as bright upon arrival.
But you could not have seen it, unless you can top the X-ray vision of Superman: In gamma rays, the event equaled the brightness of the full Moon’s reflected visible light.
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).’