/sci/ - Science & Math

>>16208374
>HOW you conclude that
>Radiometric dating of samples
>Moon has a smaller than average iron-rich core compared to Earths' larger than average iron rich core
>Oxygen isotope levels nearly the same as Earth rocks
>KREEP in samples that could only have formed in a magma ocean
>Ratios of Zinc isotopes that do not occur in regular igneous processes
>Clouds of Silica dust and gas around stars ~115ly away which would match a giant impact
>Modern computer simulations showing that Giant impact of Theia on Proto-earth was likely
>>16208378
>What he said
So yeah bunch of evidence built up over the years, have a paper showing how they analyse rocks