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The present day habitability of Mars is an area of research that has exploded hugely in the last decade, to the extent that it's often hard to keep track of everything that's going on. This is by way of background material for my other articles on habitability of Mars.

One of the most controversial theories presented on how life began on Earth is panspermia – the idea that some primitive

Nautilus is a different kind of science magazine. We deliver big-picture science by reporting on a single monthly topic from multiple perspectives. Read a new chapter in the story every Thursday.