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Life on Mars theory dealt a serious blow
(Click here to view the original thread with full colors/images)
Posted by: Ion Silverbolt
The rare, hot rains pelting Mars that likely came from water in asteroids and comets hitting the planets and the evaporation of some ice from polar caps and ice beneath the impacts would have been spectacular, said Segura. "We believe these events caused short periods of a warm and wet climate, but overall, we think Mars has been cold and dry for the majority of its history."
According to Toon, previous theories that carbon dioxide gas and clouds warmed Mars during its early history "just have not worked out quantitatively." There is no evidence on Mars of large limestone deposits from the first billion years, which would be directly linked to large amounts of C02, a greenhouse gas, he said.
Source: UofC News
Posted by: Ion Silverbolt
More space stuff. Because it's ****ing interesting. 
Posted by: redwench
indeed.
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