Black holes may be apertures to elsewhen. Were we to plunge down a black hole, we would re-emerge, it is conjectured, in a different part of the universe and in another epoch of time.... Black holes may be the entrances to Wonderland. But are there Alices or white rabbits?

Cosmic Connection: An Extraterrestrial Perspective - Chapter 36 (p. 248), Anchor Press/Doubleday. 1973