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Just had this thought. Could it be practical to use drones in Space Exploration? As in, exploration planets that have an atmosphere. The biggest problem is obviously battery power and possibly time delay, but assuming you could make a drone that can recharge itself possibly with solar/nuclear power, you could in theory use drones effectively for space colonization and exploration. The best example of this would be on Titan, since it has such a large atmosphere that isn't too extreme in terms of pressure. With Titan, you could put a solar/nuclear powered drone charging station somewhere. Then, just program the drone to fly around the area, take samples/photographs, etc. Also recharge the drone when needed. Even better would be if the drone were self sustaining using solar or nuclear power. A drone that would have the capabilities to do this would likely be far cheaper than a rover or maybe even a stationary lander, and maybe more effective as well, especially for researching the atmosphere in higher details. Drones could also possibly be useful in terms of Mars colonization. The extremely thin atmosphere would cause a problem, but in theory, if a drone were to be developed that would be light and powerful enough to fly around a little bit on Mars, then you could Drones to quickly and effectively move things around. For example, say you have 2 separate Mars colonies. You could use drones to quickly and effectively transport supplies to and from the colonies. You could also possibly use drones to set up Mars colonies by moving components around. A notable problem for Mars would be dust possible getting inside the drone. Drones could also be used to explore the upper atmospheres of some planets, particularly Venus and all of the gas giants. Obviously, going too far in any of these 5 planets would most likely destroy the drone, but in theory, you could make drones that fly around the upper atmospheres of planets like Jupiter (given the drone is well shielded against radiation) at an altitude where the pressure is similar to Earth at surface level. With a drone like this, you'd either need to have some sort of recharging station that can stay high enough in the atmosphere on its own or have the drone be self sufficient for a long enough period of time. This is just a thought. It would be pretty cool if this ever were to happen, but please let me know what you guys think.