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There hasn’t been a decent supernova in our part of the universe in living memory but astronomers in the 11th century were a little more fortunate. In 1006 AD, they witnessed what is still thought to be the brightest supernova ever seen on Earth (SN 1006) and just 48 years later saw the birth of the Crab Nebula (SN 1054).
Our knowledge of these events come from numerous written accounts, mainly by Chinese and Arabic astronomers (and of course from the observations we can make today of the resultant nebulae).
Now we can go one better. A team of Japanese scientists has found the first evidence of supernovae in an ice core.
We report abundant nanodiamonds in sediments dating to 12.9 ± 0.1 thousand calendar years before the present at multiple locations across North America. Selected area electron diffraction patterns reveal two diamond allotropes in this boundary layer but not above or below that interval. Cubic diamonds form under high temperature-pressure regimes, and n-diamonds also require extraordinary conditions, well outside the range of Earth's typical surficial processes but common to cosmic impacts. N-diamond concentrations range from 10 to 3700 parts per billion by weight, comparable to amounts found in known impact layers.
These diamonds provide strong evidence for Earth's collision with a rare swarm of carbonaceous chondrites or comets at the onset of the Younger Dryas cool interval, producing multiple airbursts and possible surface impacts, with severe repercussions for plants, animals, and humans in North America.
Originally posted by bigfatfurrytexan
reply to post by Hanslune
Well, it boils down to causation.
IF there was a cometary impact that we have missed due to the primary's being on/over the ice shelf, then we can begin to extrapolate what likely happened due to this impact.
I have a friend who believes that we caught a comet in orbit, and it either "melted" or sublimated into our atmosphere en masse. I do not believe this would happen, but what would the effects be if it did?
Of high importance to me, however, is the possible link between the Carolina Bays and this YD event discussed in TWISI's info above.