Neil deGrasse Tyson @neiltyson
A year ago today, the Universe sent a shot across our bow. A house-sized meteor exploded over Russia:https://twitter.com/neiltyson/status/434770017750487041
The 15 Feb 2013 Russian meteor, carried 25X the energy of the Hiroshima bomb. Exploding 30km up, it “only” shattered windows
Had the 15 February 2013 Russian meteor exploded 0.6 km high, as in Hiroshima, no person in Chelyabinsk would have survived.
The Russian meteor injured 1500 people, most running to the window, not remembering that blast waves travel slower than light
Without a space program that discovers, tracks & deflects killer asteroids, our extinction is assured by one. Have a nice day