Spacetime Quotes (4 quotes)
Adapting from the earlier book Gravitation, I wrote, Spacetime tells matter how to move; matter tells spacetime how to curve. In other words, a bit of matter (or mass, or energy) moves in accordance with the dictates of the curved spacetime where it is located.
At the same time, that bit of mass or energy is itself contributing to the curvature of spacetime everywhere.
With coauthor Kenneth William Ford Geons, Black Holes, and Quantum Foam: A Life in Physics (1998, 2010), 235. Adapted from his earlier book, coauthored with Charles W. Misner and Kip S. Thorne, Gravitation (1970, 1973), 5, in which one of the ideas in Einsteins geometric theory of gravity was summarized as, Space acts on matter, telling it how to move. In turn, matter reacts back on space, telling it how to curve.
I do not believe that a real understanding of the nature of elementary particles can ever be achieved without a simultaneous deeper understanding of the nature of spacetime itself.
From 'Structure of Spacetime', in Cιcile DeWittMorette and John Archibald Wheeler (eds.), Battelles Rencontres: Lectures in Mathematics and Physics (1968), 122.
Spacetime tells matter how to move; matter tells spacetime how to curve.
With coauthor Kenneth William Ford Geons, Black Holes, and Quantum Foam: A Life in Physics (1998, 2010), 235. Adapted from his earlier book, coauthored with Charles W. Misner and Kip S. Thorne, Gravitation (1970, 1973), 5, in which one of the ideas in Einsteins geometric theory of gravity was summarized as, Space acts on matter, telling it how to move. In turn, matter reacts back on space, telling it how to curve.
Wheelers First Moral Principle: Never make a calculation until you know the answer. Make an estimate before every calculation, try a simple physical argument (symmetry! invariance! conservation!) before every derivation, guess the answer to every paradox and puzzle. Courage: No one else needs to know what the guess is. Therefore make it quickly, by instinct. A right guess reinforces this instinct. A wrong guess brings the refreshment of surprise. In either case life as a spacetime expert, however long, is more fun!
In E.F. Taylor and J.A. Wheeler, Spacetime Physics (1992), 20.
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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