An asteroid impact could wipe out entire cities — what can we do to prevent that?

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 threat, but some can be cause for concern. As a scholar who studies space and international security, it is my job to ask what the likelihood of an object crashing into the planet really is – and whether governments are spending enough money to prevent such an event. To find the answers to these questions, one has to know what near-Earth objects are out there. To date,…

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