teaduslik hüpotees, mille kohaselt Kuu tekkis proto-Maast välja löödud ainest, kui sellega põrkus umbes Marsi suurune taevakeha, scientific hypothesis combining salient features of all the three older hypotheses about the origin of the Moon, according to which a Mars-sized object might have struck the proto-Earth, expelling a vast amount of material (fission hypothesis) that then condensed into orbit (co-accretion hypothesis) and incorporated a lot of material left over from the impactor (capture hypothesis)