It is not uncommon for asteroids to hit Earth. In 2013, the Chelyabinsk meteor exploded over Russia, injuring hundreds. Image credit - Alex Alishevskikh, licensed under CC BY-SA 2.0
The dangers of the Cosmos
There are a lot of things that pose a threat to our planet – climate change, natural disasters, and solar flares, for example. But one threat in particular often captures the public imagination, finding itself popularised in books and films and regularly generating alarming headlines: asteroids.
