... there are particles ... that we have never seen in a la… - Steven Weinberg

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... there are particles ... that we have never seen in a laboratory but astronomers tell us make up most of the matter in the universe — the so-called . It's dark because it doesn't radiate — it doesn't interact with light. We just know about it because of its gravitational field. What is the dark matter? ... We have a lot of ideas — all going in different directions. We don't know which is the right idea.

Steven Weinberg

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About Steven Weinberg

Steven Weinberg (born 3 May 1933 – 23 July 2021) was an American physicist. He was awarded the 1979 Nobel Prize in Physics (with colleagues Abdus Salam and Sheldon Glashow) for combining electromagnetism and the weak force into the electroweak force.

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James Hopwood Jeans Frank Wilczek Arthur Eddington Paul Dirac Freeman Dyson

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... most physicists would probably agree that the place of local fields is nowhere so secure as in the theory of photons and gravitons, whose properties seem indissolubly linked with the space-time concepts of gauge invariance (of the second kind) and/or Einstein's equivalence principle.

... I found that I was unable to explain the foundations of quantum mechanics in a way that I found entirely satisfactory.

Under ordinary circumstances, visible light is absorbed or emitted when the electrons in an atom or molecule are excited into orbits of higher energy, or sink back into orbits of lower energy, respectively.

... there are particles ... that we have never seen in a laboratory but astronomers tell us make up most of the matter in the universe — the so-calle… - Steven Weinberg

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