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" ... Finally, dust storms abound, while small micrometeorites frequently impact Mars, posing threats to surface-dwellers. ... "
" ... It was the second time the three lunar samples had gone to the auction block. The three small fragments are mostly basalt mixed with crystals of feldspar and dusty regolith, pitted with glass formed by the heat and impact of micrometeorites, then scooped up from the plains south of the Crisium basin by the Soviet Union's robotic Luna-16 mission and returned to Earth in September 1970. The 200mg of material fetched $442,500 from an anonymous buyer at Sotheby's in 1993. But although the Luna-16 samples have changed hands a few times, such an auction is a rare event, because they're the only pieces of the Moon ever brought back to Earth and placed in private hands -- legally, at least. The Soviet government presented them to Nina Ivanovna Koroleva, the widow of former Soviet space program director Sergei Pavlovich Korolev. ... "
" ... The team has a few ideas. One is that the Moon can be shielded from the solar wind when it passes through the tail of Earth's magnetic field. This can happen when the Earth is between the Sun and Moon. Another possibility is that micrometeorites strike the Moon on a regular basis. Their impacts could liberate water molecules on the lunar surface while heating the surface enough to allow oxidation to occur when they do. ... "