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While Mars is a dusty and dry planet today, new evidence emerged that methane could have warmed up its surface intermittently in the ancient past. NASA
Planets

Methane Bursts May Have Helped Water Flow on Ancient Mars

Methane under the surface of Mars could have warmed it up in intermittent bursts, which could help explain how Mars was warmer and wetter so long ago.

October 3, 2017
3:30 PM EDT