Modern Mars, dry and barren (left), compared with the same scene over 3.5 billion years ago (right), covered in water.

Where Did All of Mars' Water Go? Apparently Not Very Far

A new theory proposed by scientists at Oxford says that most of the water is still there, in the planet's crust

Around three billion years ago, Mars wasnt a frozen red planet but a warm one where water flowed. Some even suspect the whole or much of the planet was at some point covered by ocean that may have been as much...

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