The Moon was locked into orbit by Earth's gravity as it was passing by
The Moon was formed from the same cloud
of material as Earth
The Moon was formed from the collision between
Earth and another Mars-sized body
The Moon was formed from collisions and combining
of planetesimals
giant impact theory
colliding planetesimals hypothesis
capture hypothesis

The giant-impact hypothesis, sometimes called the Big Splash, or the Theia Impact, suggests that the Moon formed from the ejecta of a collision between the proto-Earth and a Mars-sized planetesimal, approximately 4.5 billion years ago, in the Hadean eon (about 20 to 100 million years after the Solar System coalesced).

thermophiles, notice the prefix thermo.

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