What it takes, physically and mentally, to leave the planet.
Going to space pushes the human body to its limits. Astronauts endure high G-forces during launch, microgravity environments that cause muscle atrophy and bone density loss, and radiation exposure. Training involves centrifuges, neutral buoyancy pools, and rigorous fitness regimens to prepare them for these extremes.
Beyond physical fitness, psychological endurance is critical. Astronauts spend months in confined spaces, far from loved ones, operating under high pressure. Training simulates these conditions through isolation missions, survival training, and intense teamwork exercises to ensure they can handle the psychological demands of spaceflight.
Training for weightlessness is notoriously difficult on Earth. Astronauts use underwater neutral buoyancy laboratories to practice spacewalks, wearing full spacesuits while submerged.