Hints: Odyssey Mars hygiene electrolyze 'terraforming' atmospheric density

Well, hearing that Odyssey had found subsurface water on Mars was enormously exciting for somebody who is involved in planning to send humans to Mars. Water has a number of important uses for us. At the most basic, it provides drinking water once it's been purified, and it provides water for hygiene purposes as well. More important than that, we can electrolyze it, we can actually split it into hydrogen and oxygen, oxygen obviously we can use for breathing and we can also use it as a fuel stock with the hydrogen for our vehicle to come back home. And we can also use the hydrogen itself in fuel cells to power our rover vehicles. So the ability to use water that exists on Mars is tremendously important to human missions on Mars.
But any colonizing of Mars would require extreme action. Some believe it would need what scientists call'terraforming', transforming the entire planet into an artificial Earth. This involves growing plants to create more oxygen, and an atmosphere.
It requires raising the temperature of the planet, raising the atmospheric density through melting the icecaps and freeing up the carbon dioxide. But the key thing about the water ice on Mars is once we've done that, then we can let that water exist free form on surface of the planet, it again will create rivers, lakes, oceans which we can use and the plants can use to survive.

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