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BBC news today have an article Traces of another world found on the Moon
It says
Can someone please help me understand. If the sun and our planets formed from the same dust cloud, then why are the isotopic ratios different?
It says
Dr Herwartz measured the difference in what is called the isotopic composition of the oxygen contained in rocks on Earth and Moon rock. This is the ratio of different forms of oxygen.
Studies of meteorites from Mars and the outer solar system show that these ratios are markedly different - rather like a fingerprint. So Prof Halliday and others are puzzled by the fact that the fingerprints of Earth and Theia seem almost identical.
Can someone please help me understand. If the sun and our planets formed from the same dust cloud, then why are the isotopic ratios different?