NASA is stress-testing Mars tech in Earth's harshest deserts — and the results are wild

NASA is taking its newest Mars exploration technologies out of the lab and into Earth's most brutal deserts, pushing drones, ...
Live Science

Trio of 'black mesas' leftover from Paleozoic era spawn rare sand dunes in the Sahara — Earth from space

This intriguing astronaut photo shows a trio of ancient "black mesas", which sit side-by-side in the Sahara desert. The dark structures have enabled a series of rare sand dunes to form around them ...