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I’m surprised that NASA envisions an absurdly massive, nuclear-powered “gravitational tug” to avoid “the biggest problem” of a contact-tug’s need to “fir[e] its rocket engine only at specific times” to compensate for an asteroid’s rotation as mentioned in this article. Cassini, in orbit around Saturn, fires its rocket engine “only at specific times” routinely. Voyager-1 and Voyager-2 have been firing theirs “only at specific times” ever since launch in 1977.