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New research tracking Mars extensive network of valleys and adds to the growing body of evidence suggesting the Red Planet once had an ocean covering a large portion of the northern hemisphere. In a new study, scientists from Northern Illinois University and the Lunar and Planetary Institute in Houston used an innovative computer program to produce a new and more detailed global map of the valley networks. The findings indicate the networks are more than twice as extensive as had been previously shown in the only other planet-wide map of the valleys forming a belt around the planet between the equator and mid-southern latitudes.
"All the evidence gathered by analyzing the valley network on the new map points to a particular climate scenario on early Mars," NIU Geography Professor Wei Luo said. "It would have included rainfall and the existence of an ocean covering most of the northern hemisphere, or about one-third of the planet's surface."
Originally posted by The_Zomar
There are definitely lakes on Mars so water is still there, but most of it may be gone like you said.
That being said, where theres water - theres life.
Originally posted by Xeven
For all we know mars could be completely frozen water under its surface crust. The crust is made from volcanoes and space dust for billions of years. If you heat mars up it might even look like Earth once the water ice melts. What we can see is the tip of the iceberg.