The fundamental question of why Mars is red has been considered for hundreds if not for thousands of years,” Adam Valantinas, ...

Mars – dusty, dry, and desert-clad – was once so rich in water it had not just lakes, but oceans, according to a new study. Observations using ground-penetrating radar have revealed underground ...

Billions of years ago, however, liquid water flowed freely across the planet. And, while NASA's various Mars rovers have uncovered signs that such water once existed on Mars, there's perhaps no ...