Episode 2: Bistronauts

Science off the Sphere

Astronaut and chemist Dr. Don Pettit does physics demos that are out of this world. Currently on board the International Space Station, Dr. Pettit presents fantastic physics that can only be demonstrated in micro-gravity.


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Challenge Question: Why can't you use a regular cup in microgravity?

Challenge Answer: Using a regular glass, water particles are attracted to the bottom, and sides of the cup. A small disturbance, such as taking a sip, would cause the liquid to separate from the glass. If the surface tension did not hold the water together, water would float around everywhere. With the "Space-Cup", the liquid will stay attached to the edges, and capillary action will keep the water connected when taking a drink.

Challenge Winner: Kyle Polansky of Southlake, TX