Its a great achievement but Scots have been in space before -
Yes, exactly that. It seems counter-intuitive, because by definition nothing can escape from a black hole. However the paradox arises because of quantum fluctuations. Space is absolutely full of pairs of virtual subatomic particles and their corresponding antiparticles spontaneously coming into existence and then annihilating one another. When this happens right on the event horizon, it's possible for one of the pair to escape the black hole and one to fall into it. As the particle–antiparticle pair was produced by the black hole's gravitational energy, the escape of one of the particles lowers the mass of the black hole. Hence the black hole evaporates.Without checking, didn’t Stephen Hawking propose that they evaporate? That “Hawking Radiation” somehow escaped from them, ultimately diminishing their mass.