Initially dubbed Swift J1913.1+1946...now re-named GRB221009A. 2.4 billion light-years away...18 teraelectronvolts. [T]hough this proximity happens to be 20 times closer than the average long gamma-ray burst, it poses absolutely no danger to life on Earth. Rather, it's tremendously exciting – an event that could These bursts mark the end of the life of a massive star – a supernova or hypernova. They can also emerge from a collision between two neutron stars. Different gamma-ray burst profiles mean different kinds of explosions, which fade in different ways. When astronomers observed a collision between two neutron stars in 2017, it produced a...