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The universe's contents include ordinary matter - stars, planets, gas, dust and all the familiar stuff on Earth, including people and popcorn - as well as dark matter, which is invisible material ...
Dark matter is called ‘dark’ because it’s invisible to us and does not measurably interact with anything other than gravity. It could be interspersed between the atoms that make up the Earth ...
The measured dark energy density is Ω Λ ≈ 0.690; the observed ordinary (baryonic) matter energy density is Ω b ≈ 0.0482 and the energy density of radiation is negligible. This leaves a missing Ω dm ≈ 0.258 which nonetheless behaves like matter (see technical definition section above) – dark matter.
Since the 1990s, studies have shown that, assuming the cosmological principle, around 68% of the mass–energy density of the universe can be attributed to dark energy. [6] [7] [8] The cosmological constant Λ is the simplest possible explanation for dark energy, and is used in the standard model of cosmology known as the ΛCDM model.
Dark matter’s interactions with other matter is impossible to perceive except when it collides with the nucleus of a visible matter atom. The nucleus recoils from the collision and releases energy.
Dark Matter is an American science fiction television series created by Blake Crouch, based on his 2016 novel of the same name. It premiered on Apple TV+ on May 8, 2024, with two episodes. [ 1 ] In August 2024, the series was renewed for a second season.
As "dark matter", baryonic dark matter is undetectable by its emitted radiation, but its presence can be inferred from gravitational effects on visible matter. This form of dark matter is composed of "baryons", heavy subatomic particles such as protons and neutrons and combinations of these, including non-emitting ordinary atoms.
One exciting possibility is that a previously unknown form of matter from the early universe might have left a trace on our history. This is known as “early dark energy,” thought to be present ...