Forget the dusty, rusty landscape you see today. Billions of years ago, Mars may have been soaking wet. Tropical storms might ...
Long before Mars turned into the frozen desert you see today, water shaped its surface in dramatic ways. Rivers cut through highlands, lakes pooled inside craters, and floods tore open canyon walls.
Far below your feet, nearly 1,800 miles beneath oceans and continents, Earth carries two massive scars from its violent youth ...