Answer:
Quantum Mechanics and Quantum Physics apply to so many aspects of science that, despite how radical it is, its still accepted. This is because almost all of astronomical physics and other areas of science would just collapse! For example, black holes appear to radiate energy, but a black hole (by definition) does not give out anything. Therefore, Quantum Mechanics says that there are certain fluctuations on the edge of the black hole's event horizon, where two particles (a negatively charged one and a positively charged one, since energy cannot be created out of nothing) spontaneously appear and immediately cancel each other out, and disappear. However, when on a black hole's event horizon, one particle is sucked in before they destroy eachother. Then, the particle leaves and survives!
The same kind of aspect can be applied to discover black hole evaporation, where a singularity slowly weathers away. In short, Quantum Mechanics is extremely important to modern day physics.