NASA's Mars Phoenix Lander has just sent back photos of the red planet's surface. From the time astronomers first turned their telescopes on Mars, we have imagined life there. Of course, that would require the planet to contain life-sustaining water. Does it?
Until recently, most people assumed that if Mars had liquid water, it no longer did and hadn't for quite some time. Just a decade ago, scientists speculated that the planet hadn't had liquid water for several billion years. The atmosphere and temperature of Mars makes the idea of liquid water -- or at least water as we know it -- seem nearly impossible. The planet is extremely dry and its distance from the sun keeps the temperature between 22 and -124 degrees Fahrenheit (5.5 and -86.6 degrees Celsius).
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