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Learn how NASA astronauts train for launch, microgravity, spacewalks, robotics, emergencies, and life aboard the International Space Station.

Astronauts train in medicine because space turns minor health issues into mission-critical emergencies, often far from immediate help.

Learn how scientists estimate the solar system’s age, what the oldest evidence shows, and why 4.57 billion years is the accepted answer.

Learn how gravity, orbital motion, and tidal forces keep moons circling planets across the Solar System and beyond.

Learn what degree astronauts need, which majors NASA values most, and how education, flight experience, and technical expertise shape astronaut selection.

Learn the technical, physical, and psychological skills astronauts need to train for space missions and perform under extreme conditions.

Discover how astronauts build crew trust, communicate under pressure, and train for teamwork in space missions.

Learn how comets move through the solar system, why their orbits are so extreme, and what changes as they pass near the Sun.

Discover what astronauts learn in training, from spacecraft systems and spacewalks to teamwork, emergency response, and survival skills.