Galactic clusters are the largest structures in the universe held together by gravity and the Ophiuchus Supercluster contains 4021 known galaxies, it's likely none of them contain life, much less intelligent life. Telescopes have seen evidence that the largest galaxy in the center of the cluster underwent a gargantuan explosion at least 240 million years earlier, it's 390 million light years away so the explosion happened at least 630 million years ago. It's thought that 270 million solar masses of gas and dust was sucked into the black hole at the center of the galaxy producing something equivalent to a supernova going off every month for a 100 million years. Something like that would probably sterilize not only the galaxy but the entire cluster. And Ophiuchus is relatively nearby so it's almost certain there are more distant clusters that suffered even larger explosions. It looks like the Milky Way has just been lucky.
DISCOVERY OF A GIANT RADIO FOSSIL IN THE OPHIUCHUS GALAXY CLUSTER <https://www.icrar.org/wp-content/uploads/2020/02/2002.01291.pdf> John K Clark -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/everything-list/CAJPayv3Enh8qTZdVOHG9z0%3DBxc_n7_R61fj8k0cz6kUS6MqK9g%40mail.gmail.com.
