# Tweet by [@keefmoon](http://twitter.com/keefmoon) on 2019-05-29 12:14:32 > [!INFO] Archived from [original tweet](http://twitter.com/keefmoon/status/1133708198999973888) In reply to: [@keefmoon](http://twitter.com/keefmoon/status/1133708083912421376) @OKftl @ethan_ring @reblavoie @katriord I’m guessing Von Neumann like probes are what you are referring to when you talk about UFOs but not “aliens”. But any probes still have to obey the laws of physics.