The most massive explosion since the Big Bang was just spotted in deep space

As far as astronomers know, the Big Bang is why we're all here. The massive explosion sent all the matter we see in the universe flying, expanding rapidly and coalescing into the stars, planets, and other objects that fill the cosmos. Now, astronomers have detected what they believe is the largest explosion ever observed by humans, and it took place in a cluster of galaxies nearly 400 million light-years away. The record-breaking explosion is believed to have originated in a black hole at the he...