A storm of boulders “as deadly as Hiroshima” was accidentally unleashed by Nasa during tests to change the trajectory of an asteroid, scientists have found.
David Jewitt, a professor of Earth and planetary sciences at UCLA, said: “The boulder swarm is like a cloud of shrapnel expanding from a hand grenade. Because those big boulders basically share the speed ofThis graphic showed the effect of Dart’s impact on the orbit of Dimorphos - Nasa/Johns Hopkins APL
Prof Jewitt said that given the high speed of a typical impact, a 15ft boulder hitting Earth would deliver as much energy as the atomic bomb that was dropped on Hiroshima, Japan, during the Second World War. The last complete image of Dimorphos, as seen by Nasa’s Dart spacecraft, two seconds before impact - NASA/APL
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