Mars may have had oceans

Ali Jarekji / Reuters

(CNN) - The idea that Mars once had oceans is a controversial one: It's been proposed before, and formations that look like shorelines have been found in images from a variety of spacecraft.Now scientists, after analyzing data from the European Space Agency's Mars Express mission, have concluded that the northern plains of Mars may have had an ocean.Mars Express' MARSIS radar, deployed in 2005, penetrates deep into the Martian surface. Scientists from the Institut de Plan

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