The gas likely burst forth as little as one million to ten million years ago.More info at National Geographic.
That would make the features relatively young, since any time less than ten million years ago is "like yesterday" in comparison to the moon's age, said Peter H. Schultz, a planetary geologist at Brown University in Providence, Rhode Island, and lead study author.
The finding could prove that the moon is still an active body, countering the long-standing belief that there has been no major lunar volcanism in the past three billion years.
Gas eruptions likely formed new Moon features
Posted on Saturday, Nov 11 2006 @ 04:59 CET by Thomas De Maesschalck
A new study suggests unusually "fresh" features on the Moon's surface appear to have been created when gas trapped inside the moon erupted through deep-seated fractures.