None here! But, there sure are stupendous sources of energy in space. Quasars, for example, emit 1,000,000,000,000 the energy of our sun, but the closest are too far away to damage Earth even if they pointed at us - like 200 light years.
There is radiation naturally present in the ground. Although it is just small Trace amounts... They strip mine phosphate in this area of Florida and part of the waste from the processing of it is probably more radioactive than they let on because they have been concentrating natural radiation.
Carbon 14, the isotope in question has two known sources on earth. Reaction in the stratosphere driven by solar radiation and nuclear explosions/reactions. The C14 concentrations in the atmosphere doubled from nuclear testing in the bomb testing heyday. Even though the half life is 5730 years and plants don’t like C14 as much as C12, the atmospheric relative concentration of C14 is almost back to pre 1950 levels! Where did it go? Oceans absorb all three carbon isotopes equally. This is one reason I have serious doubts about using atmospheric concentrations of carbon isotopes to define things like fossil fuel vs biofuel carbon sources etc. We don’t even understand where C14 comes from apparently, just that it has wide, sudden swings. It was just a couple years ago I think we found out our former estimates of how much C14 is produced in the stratosphere were overestimates. So even normal, not spike concentrations are now unaccounted for. I’m not a fan of making predictions using things we clearly don’t understand. I have lots of questions about C14! But no answer to this enigma. Interesting thread.
Agree. One theory of the source of the 700 AD spike is a supernova. But it’s assumed anything close energy wise to a supernova event would have been so bright there would be some historical record of such an event.
Which ones? The ones in slow moving saucers or the ones in cigarette shaped craft that can change 50,000 ft elevation in a second? I guess if their craft are powered by nuclear reactions it’s a viable hypothesis.