Meteor shower bring moon geysers. A month of orbiter saw more water throughout the month when the moon passed through the flow of cosmic dust which could cause the meteor to pour on Earth.
Water is likely to be released from the soil of the moon by small meteorite effects, planetary scientist Mehdi Benna of NASA Goddard Space The Flight Center at Greenbelt, Md., And colleagues reported April 15 at Nature Geoscience . The random effects indicate that the water was buried throughout the month, rather than being isolated from freezing dark craters – and the moon was wet for billions of years.
Examples of lunar soil brought by Apollo's astronauts suggest that the moon is bone dry. But over the past decade or so, many missions have encountered water deposits on the moon, including signs of frozen surface water in regions of the permanent shadow near the poles ( SN: 1
"We know that there is water on the ground," Benna said. Scientists do not know how much water is, or how long it is.
Benna and colleagues used observations from NASA's LADEE spacecraft, which changed the month from November 2013 to April 2014 ( SN Online: 4/18/14 ). LADEE spectrometers have discovered dozens of high increases in the abundance of water molecules in the exosphere of the month, the thin atmosphere of gas molecules that cling to the moon. Twenty-nine of these dimensions have raised the prominent dust flows of the galaxy.
When Earth passes through these streams, dust is burned in the atmosphere, making annual meteor meteors such as Leonids and Geminids. But since the moon has no real atmosphere, the dust pieces from both the shower leads directly over the moon, prompting those under it.
Benna and colleagues estimate that only meteorites are heavier than 0.15 grams can be released from the water. That means that the faithful eight centimeters or lunar soil is really dry – the smaller the effect of releasing water if any. Under this dry coating is a global coating of hydrated soil, with ice water clinging to the dust of the dust.
But the moon is not soggy. The kneading of half a ton of lunar soil produces almost a small bottle of water, Benna says. "It does not have much water at any rate, but still the water." And so much water came in recent months, he said. The moon may have led to at least some of this water since the time of its formation ( SN: 4/15/17, page 18 ).
Future studies can help identify and how water can be useful for human writers.
The search is "straightforward and certainly stimulating," says planet scientist Erik Asphaug of the University of Arizona at Tucson. "It's the kind of paper that's good to see published so we can debate it."