The human body isn't meant to exist without gravity. The astronauts aboard Artemis II are combatting potential physiological damage using an elegantly engineered exercise machine called the flywheel.

Powering a satellite with batteries can limit the spacecraft's operational life to about five years. A mechanical alternative, the flywheel, can store more energy and be reused more often than ...

After years of being billed as the next great revolutionary means of propulsion, flywheels may finally be ready for prime time. Aside from a few modest successes, flywheels have not lived up to this ...

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The Artemis II astronauts don't have a lot of space to exercise. That's why they've got the flywheel — a small device that ...