The current generations have been influenced in their thinking about space travel by science fictions such as Star Trek, Star Gate, Star Wars, and UFOs. However, besides the limitations of physics, distance, time, and environmental limitations such as extreme temperatures, lack of oxygen, time of travel, storage space for food, and random space debris such as meteors, asteroids, and comets, there are the practical limitations of the laws of economics. The cost of extensive space travel by humans is probably not economically feasible. That is why unmanned space exploration is currently used. Large scale human operations on the Moon or other bodies in our solar system are to all intents and purposes economically unfeasible. Satellites, unmanned exploration vehicles with robotic devices, and unmanned rocket ships are the only economical means to explore bodies in space.
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