re: Robots versus Humans
And also, robots allow mankind to share the excitement together, from Earth.
And if we want to, we can give them some human "behaviors" or "characters" to make them more likable, even if it's really not so.
It depends on how we present them, or name them or what they can do.
What matters is knowledge. Because knowledge is what remains for the future generations to build upon.
Sending humans is super inspiring, captivating, but only for the time it takes place (even less if it's too long). But sensations are not an obvious kind of legacy for our children, compared to scientific knowledge.
Raoul