Russia last year was just 30 meters in diameter and scientists say that explosion carried more energy than a large atomic bombs which is why hundreds of millions of buildings were damaged. nasa and the jet propulsion laboratory in california actively on the hunt for potential planet killers the near earth object program and it continues to recruit other nations, universities, observatories, even astronomers to look up and out into our gl axe and beyond looking for threats. so far near 181,000 near earth objects have been identified and discovered. 868 of those with diameters of at least one ki...