Mars-a-lago? Did the red planet once have sandy beaches?

The Mars we know now is arid and dusty, with punishing radiation
levels. But, as science correspondent Nicola Davis tells Madeleine
Finlay, two new studies add weight to the idea that billions of
years ago the red planet was a much wetter place. Nicola explains
why researchers now think it was once home to sandy beaches, what a
study looking into the type of rust on the planet has revealed
about its damp past, and what all this might tell us about the
former habitability of Mars. Help support our independent
journalism at theguardian.com/sciencepod