# Tweet by [@keefmoon](http://twitter.com/keefmoon) on 2015-04-19 22:01:48 > [!INFO] Archived from [original tweet](http://twitter.com/keefmoon/status/589911802680586241) RT @AstroTerry: Physics is fun in zero gravity. Spinning chain #SpaceVine shows centripetal force causes circular shape. https://t.co/C28dP…