[VadeRetro]

The thing blew up in the air, like an air-burst Hiroshima bomb only bigger. Modeling shows that a stony meteorite would do that, or any icy body like a comet. An iron meteorite of comparable size would augur all the way in, so that's one thing that can be eliminated.

[VadeRetro]

... would augur all the way in ...

It augurs poorly that I forgot the difference between auger and augur.