The ancient lunar surface once erupted with geysers of lava — and now, scientists think they know what caused those fiery fountains.
Current research suggests that the moon formed when a Mars-size object barreled into Earth in the early solar system, and for a long time, its surface was much different from the staid, unmoving landscape present today. Rather, the moon's surface was hot and active, and magma often bubbled up from below and broke the surface in fiery fountains — like a molten-hot version of Old Faithful. Until recently, researchers were unsure of the driving force behind those explosions, which could reveal more about conditions on the early moon.
But now, scientists may have found a possible culprit for the molten explosions: carbon monoxidehttp://www.space.com/30352-fire-fountains-ancient-moon-explained.html