Satellites are very expensive. The sensors on them are very expensive. Launching satellites is very expensive. One way the government has considered saving some of those costs is by piggybacking its sensors on commercial satellites. Known as hosted payloads, such packages have attracted considerable interest from the government. Josh Hartman, who was one of the Pentagon’s top space acquisition officials and is now with the Center for Strategic Space Studies, offers a step-by-step approach to get both sides closer to their goal.