This is an image of Mars.
Click on image for full size
NASA/JPL
The Climate of Mars
Mars is not quite right for life as we know it on Earth.
On a cold planet like Mars, water can become frozen into the ground. This water can only be turned into running water when the weather is warm enough.
Over the history of Mars, there seems to be evidence that it has been warm enough for running water on Mars.
As Mars cools off though, it seems that warm weather is not enough to prevent the water from being permanenty frozen into the ground.
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