After years of speculation, we can now say for sure that there is water on Mars. And not just a little – it’s a big lake. In a study published by the American Association of the Advancement of Science, scientists say they have found a 12-mile-long river, about a mile under the planet's surface.
Astronomers used radar data from the "Mars Express," a European spacecraft orbiting the planet. It took about two years of sifting through the data to confirm there was water on the planet.
Experts say the findings help to expand our understanding of the evolution of Mars, the history of water on the Red Planet, and its habitability. As for the lake itself, don’t go thinking about diving in. The subglacial deposit is super salty and very cold…and while it’s a little over 12-miles wide, it’s just about three-feet deep.
Source: Popular Mechanics