[dartuser]

It is believed to be a smaller planet collided with Earth, with Theia's mass split between the Earth and Moon.

Ah yes ... you know you have a fool-proof scientific theory when your theory actually predicts you won't find any evidence for it.

[thackney]

measuring the ratios between the isotopes of oxygen, titanium, silicon and others.

These ratios are known to vary throughout the solar system, but their close similarity between Earth and Moon

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And your theory for the formation of the moon with earth’s ratios of these isotopes is?

[Balding_Eagle]

you know you have a fool-proof scientific theory when your theory actually predicts you won't find any evidence for it.

Did you even read the article? Or comprehend what was written?

Obviously not.