No other explosion compares to this one
Galaxy clusters are among the largest known structures in the universe. There is one around 390 million light-years away, called Ophiuchus, that NASA’s Chandra X-ray Observatory has been dedicated to studying. You see, there was something unique about it: it curved strangely.
The likeliest explanation was that some massive event had released enough energy to warp the cluster. Scientists eventually realized that it had been caused by a massive black hole close to the galaxy’s middle, and that was the biggest explosion the universe had ever seen.
