The reason why scientists send space probes instead of people is because sending a space probe is cheaper and safer.
Space probes are sent in the place of people because scientists often do not have to spend as much on a space probe as they would on a space vessel that would have to take humans into space.
Also, if something goes wrong, space probes can simply be abandoned in space but we cannot do this for people. So space probes allow scientists to study the universe, without the risk of losing people to this study.
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