Question:Aside from resources, why is it preferable to send unmanned probes into space?
Unmanned space probes can withstand conditions that are lethal to humans. Just the exposure to radiation that a human would have over the years long missions to other planets would be fatal.
Launching spacecraft on rockets is very dangerous. Many astronauts have died. The main reason is that a rocket is basically a huge missile and also if anything breaks down it is not possible to send help.