Robots/probes can also be sent to more interesting places, or be equipped with sensors to actually "see" something interesting. We'll not send humans to the gr

Robots/probes can also be sent to more interesting places, or be equipped with sensors to actually "see" something interesting. We'll not send humans to the ground level on Venus, and humans would not see anything other than atmosphere from the orbit, compared to radar mapping of the Venuses surface, for example. I guess the main benefit of sending humans is that exploration/troubleshooting can be more real-time (for the people in the spacecraft).