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Catastrophe. bill: a lot of times we do these stories and the amateurs who are watching the stars at night, are the ones who figure out what is out there. are we developing a way to figure out what is coming our way? in advance? 170 years is pretty good advanced notice but are we better or not, tom? >> we are getting better. and nasa spends about $4 million a year, on looking for near earth objects that might be headed our way and the nasa budget proposes an increase in that and we'll need bigger telescopes on the ground and a space based telescope that can do a thorough job of looking for eve...

Strike the earth on a close path. bill: so we have some time. we have time to prepare, too, because we will not be around but you have a big job at nasa. because of the thinking, at some point, astronauts like yourself, you could fly to an asteroid and land on it and maybe even redirect that. is that going to be a reality, tom? >> the important thing to note is that by visiting asteroids and exploring them, we learn how to protect ourselves from this hazard, rq 36 is a known asteroid with a threat to us, but there are lots of undiscovered objects, that pose a threat to us that we don't know ab...

Astronaut, fox news contributor and planetary scientist and asteroid studier, a cochair on a task force that deals with planetary defense. welcome back. if it hits, what would happen to a major city in world. >> this is one of the larger near earth objects that crosses the earth's orbit and it would cause devastation across a region of continues intent and wipe out the eastern seaboard or the entire south central part of the u.s. but, fortunately this is 170 years in the future and there's lots of time to think... bill: that is a key components, 170 years away? how do you know that? >> well, t...