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Meteor shower shows water on the moon.

The meteor shower brings the Moon geyser. The moon probe found extra water around the moon as the moon passed through the flow of universe dust that could cause the meteor shower of the earth.

The water probably would have been released from the moon's soil in a small meteorite clash, says Mehdi Benna, a scientist at the NASA Goddard Space Flight Center in Maryland Greenbelt, Natural geology. The random effect means that the dark mud is frozen and not isolated, but the entire moon is filled with water. And the moon was wet for billions of years.

A sample of the Moon's soil taken by an Apollo astronaut suggested that the moon is bone dry. But over the past decade, several remote missions have found water on the moon. The surface water in the area with the everlasting shadow near the polar is frozen.SN: 10/24/09, p. 10).

"We knew there was water in the soil," Benna said. What scientists did not know was how widespread the water was and how long it was.

Benna and colleagues used observations from NASA's LADEE spacecraft, which turned the moon from November 2013 to April 2014SN Online: 4/18/14). LADEE's spectrometer has detected dozens of abrupt increases in the abundance of water molecules in the outer world of the Moon. This is a thin atmosphere of gas molecules that stick to the moon. 29 of them coincided with known flows of space dust.

When the earth passes the stream, the dust burns in the atmosphere and generates annual meteor showers like Leonids and Geminids. However, because there is no true atmosphere on the moon, a little dust from the same shower collides directly on the surface of the moon to comfort what is below.

Benna and colleagues calculated that only meteorites weighing about 0.15 grams could emit water. In other words, the top 8 centimeters of the lunar soil is actually dry. A smaller effect would have been to release water if it was present. Underneath the dry coating there is a whole layer of moist soil, and water ice sticks to the dust particles.

But the moon is never foggy. Benna says that squeezing half a tonne of moon soil will hardly reduce the amount of water. "There is not much water for any action, but it is still water." And it was too much water to reach the moon recently. From the time the moon is formed, you can grab at least a portion of this water (SN: 4/15/17, p. 18).

Future research can help determine whether the water can be useful to human explorers and how the water can be useful.

The findings are "plausible and provocative provocations," says Erik Asphaug, a planetary scientist at the University of Arizona in Tucson. "It is good to see what we have published so that we can discuss it."

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