The two unseen components that make up most of the universe by energy content: dark matter, which holds galaxies together by gravity, and dark energy, tied to the cosmological constant, which drives the accelerating expansion. A concept belongs here when its cited article defines one of them. Members are placed here from their own cited Wikipedia articles, each with a verbatim supporting quotation, so a reader can check why an entry sits in this group. The grouping forms part of the browse path for this section of the atlas.
All Dark Matter and Dark Energy
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Dark matter (Wikipedia)
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In astronomy and cosmology, dark matter is an invisible and hypothetical form of matter that does not interact with electromagnetic radiation, including light.
Dark energy (Wikipedia)
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In physical cosmology and astronomy, dark energy is a proposed form of energy that affects the universe on its largest scales.
Cosmological constant (Wikipedia)
Has Member: Cosmological Constant, Lead sentenceQuote, Has Member: Cosmological Constant, Lead sentence
In physical cosmology, the cosmological constant (usually denoted by the Greek capital letter lambda: Λ), alternatively called Einstein's cosmological constant, is a coefficient that Albert Einstein initially added to his field equations of general relativity.
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