A brilliant 3D rendering of Mars and its latent sources of water, the key basis for colonization. Four billion years ago, potential settlement would have been a lot easier; it's striking how much of the red planet used to be blue.

A brilliant 3D rendering of Mars and its latent sources of water, the key basis for colonization. Four billion years ago, potential settlement would have been a lot easier; it's striking how much of the red planet used to be blue.