the shevardnadze jarrad asteroids like the one that wiped out the dinosaurs don't cross the earth's past very often but smaller ones do all the time and while i live avoided the danger so far our planet is still on prepared for any possible collision. can we stop armageddon if it comes to it or is to earth defenseless against an asteroid strike while we ask former nasa astronaut astrophysicist and space and. as our world becomes more familiar. with what's beyond planet earth the potential dangers of space becoming more apparent with the threat of asteroids able to wipe out entire civilizations scarily close to our atmosphere so can we count of these dangers forwards too late is humanity's existence simply a game of chance or is it in a sense to define and protect. add lou physicists former astronaut c o b six twelve foundation welcome to the show it's really great to have you with us thank you very much for having me on now of your foundation says there's around half a million asteroids and planet earth neighborhood as big as the one that struck. in one thousand no weight which flattened