So as I understand it the moon was formed when a chunk of earth was blown into orbit when a mars like planet collided with earth, if this is the case why is the composition of moon rock not similar to the composition of rock found on earth, when the moon if just a piece of the earth its self?
In: Planetary Science
The composition of the moon IS similar to the composition of the Earth. That’s literally the what clued us in on the Moon being formed from Earth material, as opposed to forming separately from and independent source.
But on the other hand, it formed from a massive collision between the Earth and another planet right at the dawn of the solar system ahd hasn’t changed much since, while the Earth itself has been recycling it’s surface continuously since then, so it’s a convenient window to the past.
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