> It's entirely possible that a dinosaur killer (which could be considerably
> smaller than 1997XF11) will appear with virtually no notice. We don't
> have the ability to constantly monitor space for potential threats.
But we could have - right now SpaceWatch and similar projects are
non-funded, but given some reasonable funding it seems likely they
could map out most of the dangerous NEOs. But few people seems to take
Tunguska events seriously, so I suppose a city has to be levelled
before anybody takes notice.
-- ----------------------------------------------------------------------- Anders Sandberg Towards Ascension! asa@nada.kth.se http://www.nada.kth.se/~asa/ GCS/M/S/O d++ -p+ c++++ !l u+ e++ m++ s+/+ n--- h+/* f+ g+ w++ t+ r+ !y