CNN News:NASA在阳光照射的月球表面发现水

How long does it take the moon to orbit Earth? One day, 27 hours, 27 days or one year? It takes just over 27 days for the moon to orbit the Earth. We can see it more often than that because of how fast the Earth rotates.
NASA says it's confirmed the presence of water on the sunlit surface of the moon but it's not like the lakes and rivers we see on Earth. Researchers have been making closer examinations of the moon's surface. Their tools include NASA's $580 million Lunar Reconnaissance Orbiter and the $3 billion SOFIA Telescope which is mounted to a plane.
With the telescope, scientists examined the moon's surface through a wavelength that the naked eye might not be able to see. And NASA says that detected water that's trapped in glass beads or in between grains on certain parts of the moon.

It's not a lot. In one of the moon's largest craters, it's about as much as a 12-ounce bottle of water according to NASA. With the Lunar Reconnaissance Orbiter, scientists looked at moon areas that are always shadowed from the sun and theorized that many of these shadows could be filled with ice. They don't know for sure.
And if there is water here, no one knows exactly how it got there but NASA wants to do more research through future moon missions. It's difficult and expensive to carry water into space. If the moon has enough of it, it could help supply everything from rocket fuel to drinking water for visitors.