21 million years ago to be exact. Here's the thing everyone's raving about at the moment. It's when the light from this big bang, in a nearISH galaxy reached Earth. By ISH I mean 1,300,000,000,000 times further away than the sun. I think I spotted it in binoculars. Image from Sep 2 22:00UT. It's rather bright as these things go. It started when a white dwarf star sucks mass of its partner, which causes an instability. That leads to violent nuclear reactions, which cause an incredible shockwave that we are seeing now.
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