© NASAWater has recently been found on the lunar surface, but researchers are divided about how much water lies inside the moon - a new study suggests the moon was very dry when it formed 4.5 billion years ago
For decades after the Apollo astronauts touched down on the desolate lunar surface, the moon was considered to be parched. But that view began to change in 2008, when researchers found water inside tiny spheres of lunar volcanic glass at concentrations calculated to be similar to those found in some terrestrial volcanic rocks.
Now, researchers led by Zachary Sharp at the University of New Mexico in Albuquerque say measurements of chlorine in a dozen Apollo samples suggest that the moon's interior has always been extremely dry, containing 10,000 to 100,000 times less water than Earth's.
