Baby Universes (Modern Physics Letters A 5 No. 2 pp. 145-155, January 20, 1990) WITH Baby Universes II (Modern Physics Letters A 5 No. 7 pp. 453-466, March 20, 1990). [Two 1st editions in ORIGINAL WRAPPERS: HAWKING'S BABY UNIVERSES]

World Scientific, 1990. 1st Edition. FIRST EDITIONS IN ORIGINAL WRAPS OF HAWKING'S TWO PAPERS DISCUSSING BABY UNIVERSES & BLACK HOLES.

In his own words: "How can a black hole give off radiation. How can anything get out through the event horizon of a black hole. The answer is, the Uncertainty Principle, allows particles to travel faster than light, for a small distance. This enables particles and radiation, to get out through the event horizon, and escape from the black hole. Thus, it is possible for things to get out of a black hole. However, what comes out of a black hole, will be different from what fell in. Only the energy will be the same.

"As a black hole gives off particles and radiation, it will lose mass. This will cause the black hole to get smaller, and to send out particles more rapidly. Eventually, it will get down to zero mass, and will disappear completely. What will happen then to the objects, including possible spaceships, that fell into the black hole. According to some recent work of mine, the answer is that they go off into a little baby universe of their own. A small, self-contained universe branches off from our region of the universe. This baby universe may join on again to our region of spacetime. If it does, it would appear to us to be another black hole, which formed, and then evaporated. Particles that fell into one black hole, would appear as particles emited by the other black hole, and vice versa.

"To sum up: it seems that particles can fall into black holes, which then evaporate, and disappear from our region of the universe. The particles go off into baby universes, which branch off from our universe. These baby universes can then join back on somewhere else. They may not be much good for space travel, but their presence means that we will be able to predict less than we expected, even if we do find a complete unified theory. On the other hand, we now may be able to provide explanations for the measured values of some quantities, like the cosmological constant" (Hawking, Black Holes and Baby Universes, 1993). CONDITION & DETAILS: Two individual issues with original wrappers. Library stamps and notations on front wrappers, otherwise fine. Small spot in the margin and at the foot of the second paper, otherwise and bright throughout.