1973C. SaganCosmic Connectionii. xxiii. 162
It is not out of the question that a more wholesale rearrangement of our Solar System will begin, first slowly and then at a more rapid rate—astroengineering projects to move the planets about, to rearrange their masses for the convenience of mankind, his descendants, and his inventions.
1966P. Fern tr. I. S. Shklovskii & C. Sagan Intelligent Life in the Universe 472
How thick would the shell of a Dyson sphere be? [Ibid. 473] An extraplanetary civilization surrounded by a Dyson sphere would be a very powerful source of infrared radiation.
1973C. SaganChauvinism in Cosmic Connection: Extra-Terrestrial Perspective 43
John Carter could love Dejah Thoris, but, despite what Edgar Rice Burroughs believed, their love could not be consummated. And if it could, a viable offspring would not be possible. Likewise, the category of contact story, now quite fashionable in some UFO enthusiast circles, of sexual contact between human and saucerian—most recently described in a weekly newspaper headline with the modest title ‘We Sexed a Blonde from a Flying Saucer!’—must be relegated to the realm of improbable fantasy. Such crossings are about as reasonable as the mating of a man and a petunia.