PROVIDENCE, R.I., March 12 (UPI) -- Spacecraft data suggests molten rock may have been present on the moon more recently and persisted for longer periods than previously thought, NASA says.
An ocean of molten rock covered the moon's entire surface early in its history, which then cooled over millions of years, but a new analysis suggests it wasn't the last time the Moon's surface was melted on a massive scale, planetary scientists from Brown University said.