Scientists have discovered the oldest water samples on Earth that date back to about two billion years and may hold clues to life forms living far beneath the surface of Mars or other alien planets.
Researchers have known that water exists far below the ground-water that has been isolated from the water table — unseen and untouched for billions of years. To learn more about such water, scientists from University of Toronto in Canada have been working with mining companies. As miners go deeper, the researchers gain access to ever deeper sources of water.