A huge crater spotted on Mars by NASA’s Mars Reconnaissance Orbiter is showing evidence of a “wet-ground environment,” reports NBC News.
The 57-mile-wide crater, known as the McLaughlin Crater, offers evidence that water once filled the bone-dry area in ancient times. The discovery also has scientists speculating if the search for life on Mars should be done subterranean instead of above ground.
On Earth, microbes up to 3 miles (5 kilometers) or more underground make up perhaps half of all of the planet's living matter. Most of these organisms represent some of the most primitive kinds of microbes known, hinting that life may actually have started underground, or at least survived there during a series of devastating cosmic impacts known as the Late Heavy Bombardment that Earth and the rest of the inner solar system endured about 4.1 billion to 3.8 billion years ago.