Scientists have long thought there are a series of pyramid-like structures on Mars, with recent images showing one that could ...

Elon Musk revealed that his rocket-launch firm SpaceX is now focused on building a “self-growing city” of humans on the moon – backing away from his plans to launch a civilization on Mars. The world’s ...

It's an age-old debate in space circles: Should humanity's first city on another world be built on the moon, or on Mars? As recently as last year, SpaceX founder Elon Musk saw missions to the moon as ...