http://phys.org/news/2012-08-impact-crater-arctic.html

They found yet another reason to build nuclear interceptors to deflect asteroids and comet impact threats.

Sooner or later something is going to hit us. It could be like Tunguska in 1908 and destroy a city instead of a forest in Siberia- or it could be like what hit the Yucatan 65 million years ago.

Except just a little bigger and nothing larger than bacteria will survive. There is nothing written anywhere that says it will not happen tomorrow.

The wailing and gnashing of teeth over spending money on space never seems to cross over to DOD programs where obscene amounts of tax dollars are spent on cold war toys used to fight mountain tribesmen with Kalashnikovs.

For example:
http://www.bloomberg.com/news/2012-02-13/navy-discloses-811-million-overrun-on-gerald-ford-carrier.html

The completed initial aircraft carrier, the first of three in the $40.2 billion program, is projected to cost at least $11.5 billion.