An asteroid impact could wipe out an entire city – a space security expert explains NASA's plans to prevent a potential catastrophe - The Conversation US

NASA has only mapped 40% of the potentially dangerous asteroids that could crash into Earth. New projects will boost that number, and upcoming missions will test tech that could prevent collisions.

The Earth exists in a dangerous environment. Cosmic bodies, like asteroids and comets, are constantly zooming through space and often crash into our planet. Most of these are too small to pose a thre… [+7654 chars]

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