The Moon Isn't Watery After All :(

Moon Not So Watery After All, Lunar-Rock Study Says

In the past, scientists believed that the moon was bone dry; but, during recent missions, some rocks were brought back, and showed considerable traces of hydroxyl which is a compound formed by the breakdown of water. Thus, scientists believed that the Moon contained significant amounts of water. A new study, however,  by geochemist Zachary Sharp, measured chlorine isotopes and found that the chlorine isotope values were almost 25 times more than Earth's. Since chlorine is strongly attracted to hydrogen, and when they are both present in molten rock, they tend to form hydrogen chloride gas. Sharp concluded that when the rocks cooled 4.5 billion years ago, they were low in hydrogen because instead of becoming mostly hydrogen chloride gas, the chlorine bonded with other elements (leading to more chlorine isotopes). Basically, if moon rocks lack hydrogen, they must lack water.
In essence, this article shows how much isotopes can prove and how important they are in research. A prior notion was that the Moon contained a lot of water but recent study on chlorine isotopes showed how the Moon is actually very dry and contains very little water. Study is still going on about water existing on the Moon but, perhaps this means living on the Moon could actually be possible in the future?