Entries tagged #relativity on Unique.https://unique.rzen.dev/en-ushttps://unique.rzen.dev/reviews/black-hole-lab/https://unique.rzen.dev/reviews/black-hole-lab/Black Hole Lab is a free, open-source simulation of a spinning Kerr black hole in which two observers send radio pulses and log when each one hears the other.Sun, 11 Oct 2026 00:00:00 GMTlearningphysicsrelativitysimulationopen-source