Nasa’s Dart spacecraft has crashed into the asteroid Dimorphos 6.8m miles from Earth in the space agency’s first “planetary defense test”. Dart (Double Asteroid Redirection Test)  collided head-on with an asteroid the size of a football stadium on Monday in an unprecedented full-scale test of Nasa’s capacity to defend Earth from a doomsday scenario. The test was humanity’s first attempt at moving another celestial body, to see if a large asteroid hurtling towards Earth could be diverted

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