I’m old enough to (sort of) remember the old Asteroids computer game. Altough life on Earth is not quite as dogged by pieces of comets and interstellar debris hunting you around as was the case for the hero of the game, it turns out we have more to fear from asteroids than previously thought – or, as the BBC so charmingly put it, we ‘underappreciate’ the risk.
The news comes from the B612 foundation who usually monitor nuclear tests.
“Between 2000 and 2013, a network of sensors that monitors Earth around the clock listening for the infrasound signature of nuclear detonations detected 26 explosions on Earth ranging in energy from 1 to 600 kilotons – all caused not by nuclear explosions, but rather by asteroid impacts. These findings were recently released from the Nuclear Test Ban Treaty Organization, which operates the network,” the group says on its website, adding that:
“To put this data in perspective, the atomic bomb that destroyed Hiroshima in 1945 exploded with an energy impact of 15 kilotons. While most of these asteroids exploded too high in the atmosphere to do serious damage on the ground, the evidence is important in estimating the frequency of a potential “city-killer-size” asteroid.”