: the basic entity of observed Actual physical fact represented by some extent specified by 3 coordinates of spot and one particular of time within the House-time continuum postulated by the theory of relativity Event horizon, a boundary in spacetime, ordinarily bordering a black hole, past which events can not https://sewa-sound-system73840.blogunok.com/24034300/5-easy-facts-about-sound-system-rental-described