By M J Duff; James T Liu; Michigan Center for Theoretical Physics. Inaugural Conference
Read or Download 2001, a spacetime odyssey : proceedings of the Inaugural Conference of the Michigan Center for Theoretical Physics : Michigan, USA, 21-25 May 2001 PDF
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Additional info for 2001, a spacetime odyssey : proceedings of the Inaugural Conference of the Michigan Center for Theoretical Physics : Michigan, USA, 21-25 May 2001
And every cell is an entire world within itself, yet even its tiniest parts are made of millions of atoms. Meanwhile there are hun- dreds of billions of planets in our own Galaxy, and hundreds of billions of other galaxies. Sizes are like these doorways within doorways: when you pass through one, everything changes. But there’s a limit. Pure numbers go on infinitely, but sizes of actual things don’t. The universe began a certain amount of time ago and has been expanding at a certain rate; therefore it’s gotten to be a certain size, and that’s the largest size we can say anything definitive about.
Suddenly our Galaxy 15 16 The New Universe became just one among billions, and the universe became incalculably vast. Then in 1929 Hubble made an even more stunning discovery: the distant galaxies are all moving away from us, and the farther away they are, the faster they’re moving. Hubble had discovered the expansion of the universe. Reasoning backwards, astronomers realized that if the universe is expanding now, there had to have been a time when everything was much closer together. That was the Big Bang, but there was no direct evidence for it yet.
The Newtonian picture has only become more dominant since the seventeenth century. Religious people in the intervening centuries have often felt faced with a choice: either (1) to deny the validity of science and isolate themselves from much of the human endeavor, or (2) to adopt a dualistic view in which they accept science but believe that there are two kinds of reality, the spiritual and the physical, with “spiritual reality” unconstrained by the laws of physics. In such a split mind- Fig. 10.
2001, a spacetime odyssey : proceedings of the Inaugural Conference of the Michigan Center for Theoretical Physics : Michigan, USA, 21-25 May 2001 by M J Duff; James T Liu; Michigan Center for Theoretical Physics. Inaugural Conference