and alluvial fans. The water didn’t last long—just the first 1.5 billion years of the planet’s 4.5 billion year lifetime. Relatively early in its history, Mars lost its magnetic field ...

and alluvial fans. The water didn’t last long—just the first 1.5 billion years of the planet’s 4.5 billion year lifetime. Relatively early in its history, Mars lost its magnetic field ...

It’s long been all but settled science that Mars was once home to copious amounts of water. Its surface is stamped with ocean and sea basins and etched with ancient riverbeds, deltas, and alluvial ...