[ExI] The Fermi Paradox

[John Clark]

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
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.extropy.org/pipermail/extropy-chat/attachments/20200306/15dd2f6a/attachment.htm>