Dr Mahesh Anand Rock and roll
Rock and roll: it's taken more than 40 years to discover traces of Theia in samples collected by the Apollo astronauts
Dr Mahesh Anand from the Open University described the research as "exciting" but noted that the data was from just three lunar rock samples 痛經.
"We have to be cautious about the representativeness of these rocks of the entire Moon, and so further analysis of a variety of lunar rocks is required for further confirmation," he said.
Other theories have been proposed to explain why the composition of the Earth and Moon are so similar: one is that the Earth spun much faster before impact, another is that Theia was much larger than current models suggest 急救產品.
An alternative, controversial, theory proposed by Prof Rob de Meijer of Groningen University in the Netherlands is that the Earth's crust and mantle was blown into space by an accumulation of nuclear material 2,900km (1,800 miles) below the surface. It was this debris that clumped together to form the Moon.
He told BBC News that the new finding - demonstrating that there was a difference in the composition of the Earth and the Moon - did not change his view.
"The difference is too small," he said. "We don't know how the Moon was formed. What we need are manned missions to the Moon and a search for rocks deeper under the lunar surface, that have not been polluted by meteorite impacts and the solar wind."
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