[balrog666]

And just why would the comet be related to the supernova? Was it traveling at a significant fraction of the speed of light? Was it aimed at the Earth from 250 light years away?

Whatever caused the craters had to have been traveling around 6,214 miles per second,

Don't you just love that precision! About 41,000 years ago but exactly 6214 miles per second! Ah, why can't these stupid "journalists" just leave the speeds in kilometers in the first place?

[Fred Hayek]

but exactly 6214 miles per second

corresponds to 10,000 km/sec.