The universe is expanding due to dark energy from "summary" of The Quantum Universe by Brian Cox,Jeff Forshaw
The expansion of the universe is a remarkable and profound phenomenon that has captured the imagination of scientists and the general public alike. This expansion is not simply a matter of galaxies moving away from each other through existing space; rather, it is the very fabric of space itself that is expanding. This means that the distances between galaxies are increasing as the universe grows larger. The key to understanding this expansion lies in the concept of dark energy. Dark energy is a mysterious force that permeates all of space and drives the acceleration of the universe's expansion. While the exact nature of dark energy remains unknown, its presence is undeniable based on observations of distant galaxies moving away from us at ever-increasing speeds. One of the most striking pieces of evidence for dark energy comes from measurements of the cosmic microwave background radiation, the afterglow of the Big Bang. These measurements reveal the distribution of matter and energy in the early universe and provide crucial insights into the evolution of the cosmos. By studying the cosmic microwave background, scientists have been able to deduce the existence of dark energy and its role in driving the universe's expansion. It is important to note that dark energy is not the same as dark matter, another mysterious substance that makes up a significant portion of the universe's mass. While dark matter exerts a gravitational pull that helps to bind galaxies together, dark energy acts in the opposite direction, pushing galaxies apart and driving the universe's expansion.- The concept of dark energy and its role in the expansion of the universe represent some of the most profound and puzzling mysteries in modern physics. By studying the cosmic microwave background and other observational data, scientists continue to unravel the secrets of dark energy and its impact on the evolution of the cosmos.
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