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Now, we know that all the atomic dark matter could not possibly make more than about 5% of the mass of the Universe.About 3 minutes after the Big Bang, the Universe was a soup of protons, neutrons, and electrons that would eventually become today's atoms.The size is so large that the rotation period is tens or even hundreds of millions of years.
Some of the protons and neutrons stuck together to form helium, deuterium, and small amounts of other light atoms that have been around since the beginning of the Universe.
Heavier atoms, like the ones we are made of, were forged in dying stars and flung into space when those stars exploded.
So, the types of matter we know about (protons, neutrons, electrons, and neutrinos) cannot solve the dark matter puzzle.
Most scientists think there must be undiscovered types of heavy, slow-moving, weakly interacting particles making up the bulk of the Universe.
However, there is one problem with neutrinos as dark matter: With such small masses, they would have been set flying too fast to clump together gravitationally.
We know there are very large clumps of matter in the universe (galactic superclusters) and computer simulations indicate that the dark matter needs to be slow-moving in order to form these dense clumps.
We have a good idea of the number of protons and neutrons in the early universe because their density affects the abundance of light elements.
If any more than about 5% of the mass of the Universe started out as protons and neutrons, then it would have been much easier for these particles to meet in the early Universe and make light elements, and we should see more of these elements today.
Knowing Kepler's Laws and the velocities of stars in a galaxy or galaxies in a cluster, it is easy to figure out the mass necessary to keep the galaxy or cluster from flying apart.Tags: Adult Dating, affair dating, sex dating