Answer:
Because humans are able to observe beyond what was planned.
Step-by-step explanation:
Although space exploration using robots is very beneficial and efficient, humans are better explorers. It is true that the limitations that robots have in space are less than the limitations of human beings, but robots can only analyze according to the programming to which they were submitted, while human beings are able to make more ambiguous analyzes, being able to discover things outside of what was planned.