“By determining the age of zircon found in the sample, we were able to pinpoint the age of the host rock at about four billion years old, making it similar to the oldest rocks on Earth.
“In addition, the chemistry of the zircon in this sample is very different from that of every other zircon grain ever analysed in lunar samples and remarkably similar to that of zircons found on Earth.”
Based on the rock’s chemical composition, Professor Nemchin concluded the zircon formed at a low temperature.
The rock most likely also formed in the presence of water and oxygen, further suggesting it came from Earth and not the Moon.
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