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- Perhaps one of the most surprising discoveries of the 20th century was that this ordinary, or baryonic, matter makes up less than 5 percent of the mass of the universe. The rest of the universe appears to be made of a mysterious, invisible substance called dark matter (25 percent) and a force that repels gravity known as dark energy (70 percent).
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Matter is defined as any substance that has mass and occupies space. But there’s more to the universe than the matter we can see. Dark matter and dark energy are mysterious substances that affect and shape the cosmos, and scientists are still trying to figure them out.
Mar 3, 2020 · Meanwhile, dark energy is a repulsive force — a sort of anti-gravity — that drives the universe’s ever-accelerating expansion. Dark energy is the far more dominant force of the two,...
Aug 28, 2006 · It is called "dark" because it must necessarily be very weakly interacting with regular matter--much like dark matter--and it is referred to as energy because one of the few things we are certain...
Mar 30, 2024 · We call it “dark” because we can’t see it. Unlike visible matter (matter we can see, including stars, planets, water, etc.), it doesn’t appear to release or absorb light, or interact with other matter except through gravity. We know where it should be, but nothing is there when we look.
In standard cosmology, there are three components of the universe: matter, radiation, and dark energy. Matter is anything whose energy density scales with the inverse cube of the scale factor, i.e., ρ ∝ a −3, while radiation is anything which scales to the inverse fourth power of the scale factor (ρ ∝ a −4).
Nov 30, 2023 · Science. Dictionary. Astronomy Terms. What Are Dark Matter and Dark Energy? By: Robert Lamb | Updated: Nov 30, 2023. Dark energy and dark matter account for most of the universe, but what are these elusive phenomena? NASA/JPL/Hubble.
