These layers are hundreds of feet thick and are thought to have formed roughly 3.7 billion years ago, under warmer and wetter ...

A rock on Mars spilled a surprising yellow treasure after Curiosity accidentally cracked through its unremarkable exterior.

Though that scenario might have initially seemed to match parts of Mars today, the warm and wet version produced much wider spread valley networks forming everywhere from low-lying regions to more ...

Seybold's study compared valley networks on Mars with valley networks on Earth to see if groundwater was important to forming Red Planet valley connections.

Mars (yes, the planet) ... LIN: The valley networks on Mars is also formed by high-intensity rainfall. SOLOMON: Just like the Lower Colorado. But river basins aren't shaped by flooding alone, ...

Struck by the branching, twisting valley networks on the planet, she later noticed a striking resemblance to Arizona's Santa Cruz River system while flying over it.

Each scenario led to a very different-looking Mars, with valley origins appearing in drastically different locations. In the ice-melt model, valleys mostly began at high elevations, ...