Originally posted by cenpuppie
reply to post by jkrog08
I could be going off on a tangent, but jkrog08 do you find it kinda "coincidental" that our moon rotates on its axis at the same pace as our planet so that only 1 side is visible?
The only ones detected have been over 1000 ly away. It has been postulated that a GRB caused the Permian Extinction (K-T Boundary layer) in which 99 % of life was killed off some hundreds of millions of years ago
The Permian mass extinction occurred about 248 million years ago and was the greatest mass extinction ever recorded in earth history; even larger than the previously discussed Ordovician and Devonian crises and the better known End Cretaceous extinction that felled the dinosaurs. Ninety to ninety-five percent of marine species were eliminated as a result of this Permian event. The primary marine and terrestrial victims included the fusulinid foraminifera, trilobites,rugose and tabulate corals, blastoids, acanthodians, placoderms, and pelycosaurs, which did not survive beyond the Permian boundary. Other groups that were substantially reduced included the bryozoans, brachiopods, ammonoids, sharks, bony fish, crinoids, eurypterids, ostracodes, and echinoderms.