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Really Big Kaboom

There has been a thread for the last few days about the K/T
bolide, and Jim Cunningham and others have offered estimates
of the energetics involved. 30 million one megaton nuclear
bombs is certainly enough to give one pause.

Here, at the approach of the Leonid shower, is something to

Most of what we will be seeing in the next 48 hours are the
results of sand to pebble sized particles having their
kinetic energy converted into other forms, some of which
being photons, and only a tiny fraction of that energy being
in the energy range that people can observe it. Yet, these
events yield enough energy that the unaided eye can detect
it at a range of a few hundred to a few thousand miles.

Kinda boggles the mind to consider what a rock "the size of
Manhattan" could do.