Mars

New studies of two exoplanets find that one keeps its hot side excruciatingly hot and the other may be stirred by 5,000 mph winds

Startling fossil discoveries in the Chilean Andes reveal an unexpected menagerie of unique mammals that once roamed South America. The finds also overturn long-held wisdom about the continent's geologic history

It might mean life, it might mean unusual geologic activity; whichever it is, the presence of methane in the atmospheres of Mars and Titan is one of the most tantalizing puzzles in our solar system

Not too hot and not too cold means just right for water

Data entry mistake ultimately caused the craft to run out of power

Darkness and heat feed on each other in new simulations that predict a 20-year warming trend on the Red Planet

Shifting sands mimic signs of Martian water

The European Space Agency's Rosetta spacecraft snapped some spectacular photos as it swung by Mars this weekend.

The Mars Express's High Resolution Stereo Camera has mapped 35 percent of Mars's surface, and created the first detailed topography map

NASA rewrites the book on Martian landings

Water may be trickling down Martian craters as you read this

Drilling in Greenland to prepare for Mars