The giant impact theory — the idea that a catastrophic collision about 4.5 billion years ago between Earth and a protoplanet about half Earth's size created a disk of molten rock, gas and debris that consolidated to form the moon — was first set forth in the mid-1970s.
The most normally invoked grounds for lunar formation maintain that a giant protoplanet is sometimes called Theia.
When the Chemical differentiation and crystallization delivered dense material that sank to the bottom of the lunar magma ocean and a spirited crust that created the lunar highlands.
The numerous commonly invoked justification for lunar formation holds that a giant protoplanet, sometimes called Theia, struck the recently formed Earth 4.5 billion years heretofore and formed a cloud of debris that fast coalesced into the moon.
But that hypothesis has mourned from a nagging flaw. Simulations of moon-forming crashes have shown Theia would have stood as the immediate donor of lunar material.
But commentaries of Apollo moon rocks have authenticated that the moon appears in many ways a chemical clone of Earth, not Theia.
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