John Michell proposed in 1784 that near compact massive objects, gravity would increase to the extent that even light cannot escape. At that time, Newtonian gravity theory and the so called corpuscular (particle) theory of light were dominating, and the idea was that if required escape speed would be exceeding the speed of light, then light originating inside or from such distance could escape temporarily but would return. Later, in 1958, David Finkelstein using General Relativity introduced a more strict definition of a local black hole event horizon as a boundary beyond which events of any kind cannot affect any outside observer. This strict definition has led to information and firewall paradoxes, therefore, local event horizons and the notion of black holes were widely re-examined, and several theories have been developed, some with, and some without, event horizons. Stephen Hawking, one of front line developers of black hole theories, has suggested an apparent horizon be used instead of event horizon, saying “gravitational collapse produces apparent horizons but no event horizons” and eventually arrived at the conclusion that “The absence of event horizons mean that there are no black holes – in the sense of regimes from which light can’t escape to infinity. ” This does not mean denying the existence of black holes, it merely expresses the distrust towards the conventional strict definition of event horizon.