Researchers have found halite, calcite and calcium sulfate minerals, which are formed after passing through the Earth’s atmosphere, especially in meteorites. This contamination should be taken into account when inspecting parts in the future.
The fact is, once an extraterrestrial object enters Earth’s atmosphere, it doesn’t just fall off. The air in front of it heats up, causing the exterior of the meteoroid to change.
Source: Ferra

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