(Phys.org) -- The atmosphere of Mars is less than 1 percent the density of Earths. Its one of the reasons liquid water covers much of our planet but cannot exist on the Red Planet. As more research points toward the possibility of water on early Mars, scientists have increased their studies on the density of its atmosphere billions of years ago. Its not an easy task. In fact, its very difficult to even determine Earths atmospheric pressure from the same time frame.
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