YOU SAID:

The most widely accepted explanation is that the Moon formed from the debris left over after a giant impact between Earth and a Mars-sized body called Theia.

INTO JAPANESE

説明は、月が地球と火星程度の大きさのボディ Theia と呼ばれる巨大な衝撃後残った残骸から形成されることが最も広く使用。