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MARS — After years of speculation, we can now definitively say there is water on Mars. 

In a study published by the American Association of the Advancement of Science, scientists say they have found a 12 mile-long river a mile under the planet’s surface. 

Astronomers used radar data from the “MarsExpress,” a European spacecraft orbiting the Red 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.

(Photo by Manjik/iStock/Getty Images.)