Yes, but it won't have gained mass because of the cosmological event horizon resulting from the expansion of the universe. (That is, anything that's not in the

Yes, but it won't have gained mass because of the cosmological event horizon resulting from the expansion of the universe. (That is, anything that's not in the observable universe already is moving away with a effective speed due to Hubble expansion greater than the speed of light, and thus can't[0] be retrieved for use as fuel.) 0: without violating the known laws of physics