OTD in Space! Dec. 27, 1984: Famed Allan Hills Mars meteorite found in Antarctica
Weighing in at just over 4 lbs., this space rock is considered to be one of the oldest Martian meteorites ever found on Earth. Scientists estimate that it crystallized from molten rock more than 4 billion years ago, when Mars still had liquid water on its surface.
It alsoScientists determined that the meteorite probably came from an area. To figure that out, they compared spacecraft data on the chemical composition of Mars with the chemical composition of the meteorite. Scientists think that the meteorite was ejected into space when Mars got hit by a meteor about 17 million years ago, and that it hit the Earth about 13,000 years ago.
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