Citaat:
Oorspronkelijk geplaatst door Peche
I
Als we alle atomen hun energie zouden optellen, van alle dingen die er zijn in het universum, of hoeveel megawatt zouden we uitkomen? Waar komt die energie vandaan?
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Totale energie is ongeveer nul Watt.
Energie + massa = -zwaartekracht.
Lawrence Krauss: A Universe From Nothing
http://youtu.be/-EilZ4VY5Vs?t=2m8s (neem er een uurtje voor)
http://nl.wikipedia.org/wiki/Universum_uit_het_niets
Het
Boek
Considering the amount of energy packed in the nucleus of a single uranium atom, or the energy that has been continuously radiating from the sun for billions of years, or the fact that there are 10^80 particles in the observable universe, it seems that the total energy in the universe must be an inconceivably vast quantity. But it's not; it's probably zero.
Light, matter and antimatter are what physicists call "positive energy." And yes, there's a lot of it (though no one is sure quite how much). Most physicists think, however, that there is an equal amount of "negative energy" stored in the gravitational attraction that exists between all the positive-energy particles. The positive exactly balances the negative, so, ultimately, there is no energy in the universe at all.
Negative energy?
Stephen Hawking explains the concept of negative energy in his book The Theory of Everything (New Millennium 2002): "Two pieces of matter that are close to each other have less [positive] 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," he wrote.
Since it takes positive energy to separate the two pieces of matter, gravity must be using negative energy to pull them together. Thus, "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." (
bron)