It's possible to move an object, and return it to its original location, without expending energy. Ocean waves do this all the time. Based on conservation of

It's possible to move an object, and return it to its original location, without expending energy. Ocean waves do this all the time. Based on conservation of energy, I would assume that friction can weaken a gravitational wave by turning some of its energy into heat. Though if we're talking about permanently changing the location of an object, that theoretically requires a negligible amount of energy... reminds me of the magic drive in https://qntm.org/frontier https://qntm.org/frontier