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Since the Planck epoch, the Universe has been expanding to its present form, possibly with a very brief period of cosmic inflation which caused the Universe to reach a much larger size in less than 10 After the Planck epoch and inflation came the quark, hadron, and lepton epochs.
It is assumed that galaxies are distributed uniformly and the same in all directions, meaning that the Universe has neither an edge nor a center.
Discoveries in the early 20th century have suggested that the Universe had a beginning and that it is expanding The majority of mass in the Universe appears to exist in an unknown form called dark matter.
It is possible to see objects that are now further away than 13.799 billion light-years because space itself has expanded.
This means that objects which are now 46 billion light years away can still be seen in their distant past, because at that time they were much closer to us.
Having no elements heavier than lithium, these stars also produced the first heavy elements through stellar nucleosynthesis.
The Universe also contains a mysterious energy called dark energy, the density of which does not change over time.
As the Universe expanded and cooled, elementary particles associated stably into ever larger combinations.
Thus, in the early part of the matter-dominated era, stable protons and neutrons formed, which then formed atomic nuclei through nuclear reactions.
There are many competing hypotheses about the ultimate fate of the Universe and about what, if anything, preceded the Big Bang, while other physicists and philosophers refuse to speculate, doubting that information about prior states will ever be accessible.Tags: Adult Dating, affair dating, sex dating