Does the event horizon of a black hole really represents the surface of the "star" (or mass) itself? What I mean to say is: That the event horizon is the (let's say it this way) sphere surface where the scape velocity is => than the speed of light. So it is not necessary for event horizon to be exactly situated where the surface of the mass/"gravastar" really is. For example: Let's say that there's a black hole of 2cm radius and has a 5,98 * 10^24 kg. There, the surface of the black hole is 2,5cm away from the center of it. But the "imaginary surface" where the scape velocity is bigger than the speed of light doesn't have to be there./? In conclusion my question is: Is it necessary for the event horizon to be situated in the black hole surface? It's a question that I have in my head since I knew what the event horizon was. I would really thank if you could help me with this. Thank you. Philippos.