A new report posits that the collision of two black holes or neutron stars may have produced a gamma ray burst that hit Earth in the 8th century, generating a variety of chemical isotopes that can be found in ancient tree rings and ice cores. What do you think?


“‘May have?’ Wow!”

Silvio Mazzotti • Spindle Repairer

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“I’ve always wondered where all these isotopes came from.”

Penney Scott • Quill Cleaner

“Wow, tree rings just keep getting more and more interesting.”

Don Gallardo • Auctioneer