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Originally Posted by Huevos Grandes
But the dark matter / dark energy discussion has typically revolved around the unexplained high velocity of galaxies and galactic clusters. Gravity is actually a very weak force in atomic terms. It takes significantly large bodies to see and measure these effects.
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The high velocity of remote galaxies is easily explained: space is expanding in proportion to itself. The more space there is, the faster it expands. This is what Hubble discovered. Consider the national debt. It is "expanding" at the rate of about $1300 per second! Phenomenal! How do you explain the United States' debt expanding at $1300/sec? It is easily explained: its just billions of $25 savings bonds compounding at $0.00000003/s, or 4% APR.
Likewise, the high velocity of remote galaxies is easily explained: it is just gargantuan volumes of space expanding expanding at an
infinitesimal rate. The velocity is high when you go to billions of light-years distance (just as 4% APR comes out to a lot when the debt is in the trillions of dollars), but the rate of expansion is infinitesimal. The rate of expansion is so small, 0.000000000073/yr, that the energy involved is also very small. And the energy emitted by visible matter easily explains energy involved in the infinitesimal expansion.
When astronomers report on distant galaxies, they come up with a lot of "gee-whiz" numbers. Don't let the numbers fool you: the rate of expansion is infinitesimal, and so is the rate of energy gain, and so it is easily explained.