Nuclear Particle Quotes (2)

Consideration of particle emission from black holes would seem to suggest that God not only plays dice, but also sometimes throws them where they cannot be seen.
'The Quantum Mechanics of Black Holes', Scientific American, 1977, 236, 40.
See also:  |  Black Hole (7)  |  God (121)

There are something like ten million million million million million million million million million million million million million million (1 with eighty zeroes after it) particles in the region of the universe that we can observe. Where did they all come from? The answer is that, in quantum theory, particles can be created out of energy in the form of particle/antiparticle pairs. But that just raises the question of where the energy came from. The answer is that the total energy of the universe is exactly zero. The matter in the universe is made out of positive energy. However, the matter is all attracting itself by gravity. Two pieces of matter that are close to each other have less energy than the same two pieces a long way apart, because you have to expend energy to separate them against the gravitational force that is pulling them together. Thus, in a sense, the gravitational field has negative energy. In the case of a universe that is approximately uniform in space, one can show that this negative gravitational energy exactly cancels the positive energy represented by the matter. So the total energy of the universe is zero.
A Brief History of Time: From the Big Bang to Black Holes (1988), 129.
See also:  |  Energy (38)  |  Gravity (34)  |  Matter (61)  |  Universe (138)

back arrow
Custom search within only our quotations pages:
Sitewide search within all Today In Science History pages:

Visit our Science and Scientist Quotations index for more Science Quotes from archaeologists, biologists, chemists, geologists, inventors and inventions, mathematicians, physicists, pioneers in medicine, science events and technology.

Names index: | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |

Categories index: | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |



Site Navigation



If you find this site useful, please add a link from your site.


Today in Science History
Quotations
by scientists, inventors, on science and more.
- Go To Index -





8,506,852


Test Link - Please Ignore








Locations of visitors to this page