wrote in message
...
and remember- velocity is relative. Earth is moving, as is the chunk
of space rock. if both are moving at about the same speed in about the
same direction it will have an impact speed about what gravity gives
it as it falls... still enough to bust through your roof.

Even so, you have the gravitational potential energy (wow that's an
incredibly long couple of words for something so simple) of falling to Earth
a few thousand miles... that's a generous acceleration and will have it
streaking hypersonically through the atmosphere anyway.

Tim

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