Evidence for an early lunar magma ocean comes from orbital data showing an abundance of plagioclase, a lightweight mineral that crystallises from and floats to the top of magma.

根据轨道数据资料，月球早期岩浆海洋的迹象显示了月球上含有丰富的斜长石，它是一种从岩浆中结晶出来、并漂浮在岩浆顶上的轻矿物。

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"We have had very detailed mapping of that basin from images, from orbital spectral data, but we have not had high-resolution of its interior structure, " Grail's chief scientist, Prof Maria Zuber, who has been speaking at the Lunar and Planetary Science Conference (LPSC) in The Woodlands, Texas, told BBC News.

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This differential has been pretty constant ever since the satellite data was corrected for orbital and sensor issues.

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Dr Christy admits that orbital decay has an important effect on the data.

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