Little boy’s hearts are broken when they realize that robots do this better—no personal glory for that. The dirty little secret is that the human body cannot survive long, protracted space journeys. It has been shown over, and over, but the science won’t convince the childish and the obsessed. The bones dissolve.
You don't know what you're talking about. Bone loss in microgravity has been stopped by demonstrated countermeasures. Even if that were not the case, all it means is that we would have to use artificial gravity (i.e., rotating spacecraft) for long-duration trips.
“cannot”
the word of fools and doubters
Simulating gravity by spinning the carrier capsule would solve the bone problem, but there’s still a mess of other issues in travel such as dealing with radiation.
If we ever were to reach another planet I see very little chance of a human survival/procreation on it. We would have to hit a billion to one lottery that the planet has nearly identical atmospheric composition as ours.
Terraforming Mars might be the best option for leaving earth but something like that would take quite a long time.