God I love this. It’s a water droplet experiment on the International Space Station in zero gravity:
International Space Station Expedition 30 astronaut Don Pettit injects air bubbles inside a sphere of water to demonstrate physics in space for ‘Science off the Sphere.’
They’re calling these “anti-bubbles” – i.e., air bubbles inside a bubble of water so that you’re left with an outer right of water. Hard to explain, awfully cool.
There’s a second video I’ve posted below showing a water droplet “orbiting” knitting needle in space. Also way cool.
First the anti-bubble:
Then the water droplet orbiting the needle: