Learn why NASA's mechanical battery system outperforms lithium-ion in durability and precision for energy storage. NASA's ...

A flywheel energy storage system works by spinning ... more stable and will allow it to store energy efficiently in a vacuum ...

The flywheel is made out of carbon fiber and spins in a vacuum at speeds up to 60,000 rpm. That stored energy allows a four-cylinder-powered car to step off the line with more authority ...