On a February morning in 2013 , a rock from space the size of a house exploded over a Russian city with the force of thirty Hiroshima bombs and no one saw it coming , because it had come at us straight out of the glare of the sun , invisible to every...

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• spacedaily.com On a February morning in 2013 , a rock from space the size of a house exploded over a Russian city with the force of thirty Hiroshima bombs and no one saw it coming , because it had come at us straight out of the glare of the sun , invisible to every...