... Tonight's Sky . ... DISK т?? ... Scientists explain why Moon rocks contain fewer volatiles than Earthт??s . ... Scientists at the Southwest Research Institute (SwRI) combined dynamical, thermal, and chemical models of the Moon's formation to explain the relative lack of volatile elements in lunar rocks. ... The scientists suggest that the materials the Moon initially accumulates from the outer disk could be volatile-rich, followed by a final 100 to 500-kilometer layer of volatile-poor material. ...