On the contrary, Boris,
"Lunar ice" might sound a little strange to many people, but it didn't sound so strange to three Caltech researchers who, in 1961, suggested a few plausible arguments for its existence. The three (Kenneth Watson, Bruce C. Murray, and Harrison Brown) theorized that, since the Sun never deviates more than 1.6° from the Moon's equatorial plane, some crater floors near the lunar poles might lie in constant shadow. At 40° to 50° Kelvin, these "cold traps" could keep ice so solidly frozen that almost none of it would escape into space.
Well, it took up until 1994 with the Pentagon Star Wars Satellite Clementine to put that theory to test.
The result was a finding of an ice cap on the south pole equal the volume of a small lake ~approx 1 billion cubic meters in size.
Also, it wasn't specifically hydrogen they detected either because although the Clementine spacecraft did not carry instruments designed to look for lunar ice, during the mission, they improvised an experiment that allowed them to address this question. Radio waves are reflected from planetary surfaces differently depending on the compositional make up of those surfaces. Specifically, radio waves are scattered in all directions by reflection from surfaces made up of ground-up rock (as are the terrestrial planets, which include most of the Moon, Mercury, Venus, Mars, and the asteroids), while radio waves are reflected more coherently from ice surfaces (the polar caps of Mercury and Mars and the icy surfaces of Jupiter's satellites Europa, Ganymede, and Callisto). This happens because ice acts as a partly transparent medium for radio waves; think of ice as similar to a headlight reflector on a bicycle fender, which shines brightly when illuminated by light because of the many internal reflections produced by the translucent plastic of the reflector. Echoes of these waves were obtained from the large dish antennas of the Deep Space Network on Earth. The permanently dark regions around the south pole have the radar reflectance properties of ice, rather than the ground-up rock powder characteristic of the rest of the Moon's surface. Additional data taken on orbits where the reflected radio spots were not over these south polar regions and at the north pole do not show this ice signature.
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Kind regards,
Dave.