>> it may be the clue of what we can do in the future to try to save life here on earth. >> nasa says it does not see any asteroid posing and immediate threat to earth. but in 2013, a massive media are escaped detection exploded over a remote russian village, injuring some 1500 people. >> impacts from asteroids have had a profound effect on life on earth. you can ask the dinosaurs about that. >> 66 million years ago, an asteroid nearly a mile wind made it through the atmosphere, striking mexico's peninsula. wiping out most of the dinosaurs, preventing a future meteor struck will require advanced notice unlocked. >> it is very reliable that nasa and other species can have decades of time. can't track these things reliably 400 plus years. >> with enough warnings, scientists hope that a dark