It is still unclear whether the hydrogen represents the release of water by the heat of the impact, or whether it simply sheds light on the way that water is formed on the Moon from its chemical constituents.
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Before Max was even tired, the moon had fallen through the water and the sun had risen to replace it.
The first two are plentiful in outer space, and mounting evidence, like recent photographs of Mars and Jupiter's moon Europa, suggests that water is plentiful as well.
That's why scientists are so interested in water at poles, and the fact Moon dust works well with microwaves and could theoretically be used to make a paved surface if you created roads.
That is, the moon pulls hardest on the Earth's oceans on the side facing the moon, making a bulge of water (high tide).
Tide: periodic rising and falling of large bodies of water resulting from the gravitational attraction of the moon and sun acting on the rotating earth.
Crops need a sheltered environment, protected from the extreme temperatures and frightening levels of radiation found on the moon's surface, with water, carbon dioxide and light.
What is known is that 3.5 billion years ago, Crotts says, the moon regularly spewed forth large amounts of water vapor and sulfur dioxide through volcanic surface vents.
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"It's quite likely that this moon will now join the ranks of Mars and Jupiter's moon Europa where you might have liquid water - and the biologists could start getting interested in this being a place were life might possibly arise, " enthused Dr Torrence Johnson, a Cassini scientist from Nasa's Jet Propulsion Laboratory in California.
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The bay sits at the base of a gorse and hawthorn-laden cliff valley, with a half-moon of white sand looking out over the water.
Lasers beamed from landing craft could, he says, power rovers in sunless areas of the moon or Mars, such as craters where water might be found.
The idea that there might be water or, rather, ice on the moon goes back to 1961.
And water would be all the more exciting on Ganymede because it is the largest moon in the solar system (larger even than the planets Mercury and Pluto) and, like earth, it has a permanent magnetic field that protects part of its surface from bombardment by certain sorts of life-destroying radiation.
But what's novel about the CEAC design is that it incorporates a bio-regenerative life-support system -- the kind of technology that could one day not only feed an outpost on the moon or Mars, but also provide it with oxygen and recycle its water.
Others were simply overwhelmed by the amount of water pushed ashore by the giant storm, which hit at high tide during a full moon.
The moon is of great interest because of hints that it may have a huge ocean of water beneath its surface.
In a section on water in outer space we learn that there is a lake-size layer of ice on the moon's south pole, that Mars once had rivers, that there is steam in the sun's atmosphere.
New this year is a three-storey circular light installation entitled Rising Moon, made from 7, 000 plastic bottles and other recyclable materials floating on a pool of water in Victoria Park.
It's often said that we know more about the surface of the Moon or even of Mars than we do about the two-thirds of our planet covered by water.
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