This undated handout image provided by NASA shows a color-enhanced image of the delta in Jezero Crater, which once held a lake. Every new discovery makes it seem more likely that we are not alone. The... more 
This undated handout image provided by NASA shows a color-enhanced image of the delta in Jezero Crater, which once held a lake. Every new discovery makes it seem more likely that we are not alone. The case for some kind alien life somewhere else in the universe is steadily building. In the past few days, scientists have revealed there are three times as many stars as they previously thought and that a bacteria can live on arsenic, expanding our understanding of how life can thrive under the harshest and strangest environments. Those came on the heels of the first discovery of a potentially habitable planet. less 
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Associated Press | Photo By NASA/JPL
Wed, Dec 8, 2010 6:17 AM EST