Since the last visit to the moon people has been almost forty years, and discoveries made possible by the efforts of the astronauts, continues to this day. The final mission of the American astronauts on the program "Apollo" was held in 1972. Then with the surface of the moon to the Earth were taken samples of rocks, which geologists study involved more than one decade.
As it turned out, only modern analytical methods can collect a maximum of information that are stored by the Americans brought samples.
A research team from Brown University (USA) has found that the lunar mantle may contain less water than the upper mantle of the Earth. That is the conclusion they came to, investigating ion microscope samples of the "orange soil" as named by the astronauts 17 ½ th mission, collected in 1972. "In 2008, we assumed that the water content in the lunar magmas should be comparable to the amount of water in the Earth's upper mantle. Today, we have proved that the way it is "- said Alberto Saal, a professor of geology at Brown University.
Ueynreyh Thomas, a student of professor, found the melt inclusions of small granules in thousands of samples rich in titanium "orange soil". According to scientists, to find these inclusions was as difficult as finding a needle in a haystack. It is these melts contain water, a survivor of the last hot moon. "Unlike most of the molten volcanic rock inclusions enclosed in crystals that prevent the escape of water and other light substances," — said James Van Orman, author of the study.
Analysis of rocks will calculate how much water is contained in the moon before the eruption of lava billions of years ago, when the Earth's satellite, there was active volcanoes. According to modern concepts, the moon was formed from the remnants of the collision of Earth with a massive body. Discovery scientists pointed out that while the impact vaporized a lot of water, which then became part of the lunar rocks. "The work has shown that the water in the lunar magma may contain a hundred times larger than previously thought", — the scientists in a paper published in the journal Science.