#physic # [[Epistemic status]] #shower-thought #to-digest # Related - [[Penrose singularity theorem]] - [[Conformal cyclic cosmology]] # TODO > [!TODO] TODO # Horizons ## Event horizon [[Roger Penrose]] describes Event horizons as the boundary at which the gravitational pull of a black hole becomes so strong that within this point, even light cannot escape. According to Penrose's calculations, the event horizon marks the point of no return for material objects, meaning that once an object has crossed this point it can never escape the black hole's gravitational pull. Penrose concluded that the event horizon marks the boundary between our visible universe and the unknown. ![[Pasted image 20220823084501.png]] ## Particle horizon ![[Pasted image 20220823084604.png]] # External links