apparent remnants of a supernova, previously dated to 10,000ya (10ka), has been redated and is now proposed to be identified as the remnants of a supernova that the chinese recorded observing ~ad185, which would put it ~1821ya

original linkie

another story

as an afterthought, how many other celestial objects, previously dated much older, should now be re-examined a/o redated

what was wrong with the earlier dating methodology

i mean we are talking about a variance of >80% younger here...hardly a trifling error/misreading/miscalculation (although it will likely be *spun* that way)

ahh, the dating games we play, eh :-)