At an estimated 2 billion years old ... in liquid form and in great abundance around 4.1 billion years ago. This was during Mars' Noachian period, when the watery Martian surface was intensely ...

The surface of Mars is known for being an extremely cold, desiccated, and irradiated place. But as its many surface features ...

The discovery, reported in the journal Proceedings of the National Academy of Science, adds weight to the theory that up to a third of Mars was once covered by oceans 3.6 billion years ago.

The NASA rover "Curiosity" discovered what scientists say is the largest ever seen organic molecules on Mars, raising ...

The findings are the latest evidence indicating the existence of this hypothesized ocean, called Deuteronilus, roughly 3.5 to 4 billion years ago, a time when Mars possessed a thicker ... journeyed ...

While the presence of these molecules is not proof of ancient life on Mars, scientists say it shows we could detect chemical ...