Asteroids are deep-space bodies orbiting the Sun, not the Earth, and traveling to one would mean sending humans into solar orbit for the very first time. Facing those challenges of radiation, navigation and life support on a months-long trip millions… — Rusty Schweickart Copy Share Image
I can only think of one experience which might exceed in interest a few hours spent under water, and that would be a journey to Mars. — William Beebe Copy Share Image
