Richard Panek – The 4 Percent Universe
English | Size: 417.50 MB
Category: E-book
The book’s namesake comes from the scientific confusion over how ordinary matter makes up only four percent of the mass-energy in the universe, with the rest consisting of mysterious dark matter and dark energy that are both invisible and almost impossible to detect. It is due to dark matter that galaxies are able to keep their shape, with the mass of dark matter creating enough gravitational force to hold the stars that make up a galaxy together. Dark energy, however, is a substance or force responsible for the accelerating expansion of the universe over time
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