Strong magnetic fields suspend two bismuth spheres in a fluid, mimicking the weightlessness of space. Finely crushed pieces of bismuth can be seen flowing in streaks around the two spheres.
Image Credit: R. J. A. Hill/University of Nottingham/PRL
Without gravity, seemingly mundane experiments on Earth can become mesmerizing — and that's especially true for fluid dynamics.
When they shook the suspended spheres, they attracted one another. Shaking above a critical frequency even caused the two spheres to orbit each other like a binary star system. Now that's how you bring space down to Earth.