Think how water acts in space – it wants to stick together. If you let it float, it forms into a ball.
Other material likes to do the same thing. At the size of a planet the math is different, but the way it behaves is basically the same.
Here’s Chris Hadfield doing a neat experiment showing how water likes to stick to itself (and his hands) in space. https://youtu.be/o8TssbmY-GM
Latest Answers