Oversimplifying, but the majority of the particles created are massless particles (usually photons), and a photon outside the event horizon can, by definition,

Oversimplifying, but the majority of the particles created are massless particles (usually photons), and a photon outside the event horizon can, by definition, escape. For a more detailed answer with references, see the last answer here at https://physics.stackexchange.com/questions/89983/how-many-of-which-particles-are-in-hawking-radiation https://physics.stackexchange.com/questions/89983/how-many-o... .