Why isn’t the perpetual motion possible? Why has the internal-combustion engine a law efficiency? Why do the simmetries in physics “break”? The answers to these and other questions involve the idea of equilibrium, that is essential for modern physics.
The Universe is populated by asteroids, comets, but certainly black holes are its most mysterious and fascinating inhabitants. After the tales, the descriptions and the exciting examples told by grandpa Gino, professor of astronomy, the black holes will have no more secrets!