The evidence found indicates that the past winter there were oceans on the planet.
Previously there were two possibilities how the planet Mars in the past. First, the surface where the cold and dry. Secondly, Mars had a warm and wet conditions, which allows the planet have the lakes, seas, and rainfall for long periods of time.
Now, as quoted by LiveScience, researchers found traces of chunks of ice on Mars. That is, there is a third possibility, regarding the condition of the surface of Mars in the past, that is cold and wet. These conditions allow Mars had oceans and seas are partially covered in ice and glaciers.
Curious? See complete photos taken NASA's Mars surface in some period of time regarding the red planet here. NASA photographs north pole of Mars, also the rocks in the planet that reveals the presence of ancient water.
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