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Who said: “God does not care about our mathematical difficulties. He integrates empirically.”
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Home > Category Index for Science Quotations > Category Index U > Category: Untenable

Untenable Quotes (2 quotes)

The theoretical idea does not arise apart from and independent of experience; nor can it be derived from experience by a purely logical procedure. It is produced by a creative act. Once a theoretical idea has been acquired, one does well to hold fast to it until it leads to an untenable conclusion.
'On the Generalized Theory of Gravitation', Scientific American (Apr 1950). Collected in David H. Levy (ed.), The Scientific American Book of the Cosmos (2000), 14.
Science quotes on:  |  Conclusion (157)  |  Creativity (70)  |  Experience (338)  |  Hold (92)  |  Theory (690)

The very closest stars would require many years to visit, even traveling at the speed of light, which is impossible according to Einstein's theory of relativity. Today's fastest spaceships would require 200,000 years to travel to Alpha Centauri, our closest bright star. The energy required to send a hundred colonists to another star, as Frank Drake has pointed out, would be enough to meet the energy needs of the entire United States over a human lifetime. And these estimates are regarding nearby stars. When we consider the distances across the entire galaxy, and between galaxies, interstellar travel seems absolutely untenable.
As co-author with his son, Marshall Fisher, in Strangers in the Night: a Brief History of Life on Other Worlds (1998).
Science quotes on:  |  Alpha Centauri (2)  |  Frank Drake (4)  |  Albert Einstein (605)  |  Energy (214)  |  Estimate (28)  |  Galaxy (46)  |  Human (548)  |  Impossibility (52)  |  Lifetime (28)  |  Space (257)  |  Speed Of Light (14)  |  Star (336)  |  Theory Of Relativity (14)  |  Travel (61)  |  United States (31)


Carl Sagan Thumbnail In science it often happens that scientists say, 'You know that's a really good argument; my position is mistaken,' and then they would actually change their minds and you never hear that old view from them again. They really do it. It doesn't happen as often as it should, because scientists are human and change is sometimes painful. But it happens every day. I cannot recall the last time something like that happened in politics or religion. (1987) -- Carl Sagan
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