Time was when the solar system had two watery worlds. Directly next door to the warm, wet, loamy Earth was the warm, wet, loamy Mars, both planets sloshing with oceans and running with rivers--and both possibly teeming with life. Billions of years ago, however, the low-gravity Mars had both its air and water leak away, causing the planet to become the dead, freeze-dried place it is today.
That, in any case, is what the prevailing thinking has been. Now, however, it appears that thinking may be wrong. Last week NASA released a flurry of new images from the Mars Global Surveyor...
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