A Spacecraft With Four Little Quartz Balls

They get them going four thousand revolutions per minute, a like, it's got little jets of helium, you know, hitting it kind of on the sides. Provides a little tork by shooting this stream of helium at it. And then it evacuates the chamber, so there's no helium left. So you have this whole spacecraft, and its sort of surrounding this levitating ball of spinning quartz. They've not done it exactly perfectly, but they estimate that once they spin this thing up, it shouldn't slow down due to friction or impurities for 15 thousand years.