American astronomer (1906-1997) best known for discovering Pluto in 1930. ALS signed “Clyde W. Tombaugh,” 8.5 x 11, October 3, 1984. Letter to Chris Pirrello, in part: "Regarding your question whether life exists elsewhere other than on Earth: The physical and chemical conditions that would permit the existence of life on a planet are rather narrow—and to be at the right distance from the home star and about the right size planet is one chance in perhaps 10,000 or 100,000. The other 8 planets in the Solar System do not have the right conditions or environment. But we know from spectrographic analysis that the Universe is made of the same elements and obeys the same laws of Physics & chemistry on Earth. Our Sun is a typical star, identical to billions of others in our home galaxy—the Milky Way. Why would our Sun be so peculiar as being the only one having a planet with intelligent life on it?…Thru-out the Universe, there should be trillions, if not, quadrillions of Earth-like planets. Surely, we are not alone." Upper right corner bears Tombaugh's return address label. In fine condition.
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