If life ever existed on ancient Mars, it may not have found a way on the surface -- but several miles below it. A new study suggests that the most habitable part of Mars in the past was likely its subsurface.
The study published Wednesday in the journal Science Advances.Life, as we understand it on Earth, requires some basic ingredients. Water is one of those. And for years, NASA's succession of robotic missions has been"following the water" on Mars to learn more about the planet's history, including if it ever supported life.
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