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Claimed water at the lunar poles was, at first, attributed to comet impacts over the eons. This was an easy explanation. Subsequent analyses, including analyses of Earth-Moon isotopes versus comet isotopes, showed that comet water does not match Earth-Moon isotopes, while meteoritic water is very close.
These meteorites either contain a proportion of water or minerals that have been altered by water. This suggests that the asteroid from which these meteorites originate must have contained water. At the beginning of the Solar System this would have been present as ice and a few million years after the asteroid formed the ice would have melted ...
CI chondrites contain between 17 and 22 weight % water- more water than comet 67P/Churyumov–Gerasimenko. [102] [103] [104] Their high porosity (of up to 30%) seems to be correlated to those facts. The water is mostly tied up in water-bearing silicates.
The presence of volatile organic chemicals and water indicates that they have not undergone significant heating (>200 °C) since they were formed, and their compositions are considered to be close to that of the solar nebula from which the Solar System condensed. Other groups of C chondrites, e.g., CO, CV, and CK chondrites, are relatively poor ...
The Winchcombe meteorite is a rare and pristine carbonaceous chondrite, and it likely holds clues about early Earth's composition—and where our water came from.
Because ordinary chondrites represent 80% of the meteorites that fall to earth, and because ordinary chondrites contain 60–80% chondrules, it follows that (excluding dust) most of the meteoritic material that falls on earth is made up of chondrules. Chondrules can range in diameter from just a few micrometers to over 1 centimetre (0.39 in).
The meteorite struck Earth when it was still in its early years, a water world with only a few continents sticking out of the sea. In their fieldwork, Drabon said, they were looking for spherule ...
The meteorite has been named the "Charlottetown Meteorite" and was found to be made of iron, magnesium, silicon and oxygen. The fragments are now a part of the University of Alberta Meteorite ...