High above the Earth, in the fixed ring of geostationary orbit where communication satellites silently sustain modern life, a new kind of caretaker is on its way. Northrop Grumman's robotic spacecraft — launched Tuesday aboard a SpaceX rocket — carries three xenon-powered jetpacks designed to revive satellites that have nearly exhausted their fuel, offering operators SES and Optus a reprieve from the enormous cost of replacement. The mission asks a quiet but consequential question: what if the things we send into space need not be abandoned when they age, but tended to instead?