Edit. Hutchinson & Co (Publishers) Ltd, 1977 London. 8ºM (22,5x14cm) 204 págs. Cartoné con sobrecubierta ilustrada. Sobrecubierta deslucida. Buen estado general. «In a time of spectacular developments in the new astronomy, the concept of black holes is the most exciting. As scientific evidence for them mounts, black holes loom as an ominous development in the life, measured in billions of years, of the universe. A black hole is a dense concentration of matter, so dense that its enormous gravitational forces suck in everything, including light waves, within its reach…»