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Dark energy pushes galaxies apart from "summary" of The Fabric of the Cosmos by Brian Greene

Dark energy is a mysterious force that appears to be driving the accelerated expansion of the universe. It is not like any form of energy that we are familiar with, such as solar, electric, or kinetic energy. Instead, dark energy is a property of space itself, filling the vacuum of space with a constant energy density. This energy exerts a negative pressure that drives the universe to expand at an ever-increasing rate. The presence of dark energy can be inferred from observations of distant supernovae, which revealed that the universe is expanding at an accelerating pace. This discovery was unexpected, as it was previously believed that the expansion of the universe should be slowing down due to the gravitational attraction of matter. However, dark energy's repulsive force overwhelms the pull of gravity on cosmic scales, causing galaxies to move away from each other at an increasing rate. The effect...
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    The Fabric of the Cosmos

    Brian Greene

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