This is an artist's concept of an early Mars with liquid water (blue areas) on its surface. Ancient regions on Mars bear signs of abundant water - such as features resembling valleys and deltas ...

Mars exploration has been guided by the search for water. The more complex quest by Mars Science Laboratory for habitable environments should illuminate the Martian environmental history, and ...

Some scientists aren't so sure. Scientists are confident Mars was once abundant with water, as seen in massive flood-carved channels, ancient river valleys, and minerals that form only in liquid ...

"Studying this area provides a unique opportunity to investigate whether large bodies of water ever existed in Mars' northern lowlands and to understand the planet's climate history." The discovery ...

Utopia Planitia dates to the Hesperian Period, or 3.7 billion to 3 billion years ago, and it lacks abundant evidence for standing water, unlike more ancient regions of Mars, said Aaron Cavosie ...