What was the substance that allowed the ship to deflect the force of gravity in the 1964 film, First Men in the Moon ?

Cavorite is the fictional substance invented by Joseph Cavor that deflects gravity in the movie, First Men in the Moon.

In 1899, Arnold Bedford and his fiancée Katherine Callender – known as Kate – meet an inventor, Joseph Cavor, who has invented Cavorite, a substance that will let anything it is applied to or made of to deflect the force of gravity and which he plans to use to travel to the Moon. Cavor has already built a spherical spaceship for this purpose, taking Arnold and (accidentally) Kate with him. Whilst exploring the Moon, Bedford and Cavor fall down a vertical shaft and discover to their amazement an insectoid population, the Selenites, living beneath the surface. (Cavor coins this name for the creatures after the Greek goddess of the moon, Selene). After escaping from the Selenites back to the surface, they discover that their ship, still containing Kate (who stayed behind because Cavor had brought only two spacesuits), has been dragged into their underground city.