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The Dynamical Evidence for Dark Matter

FEB 01, 1992
Studies of the dynamics of galaxies show that at least 90% of the mass in the universe is in some invisible, unknown form.
Scott Tremaine

Almost all of our information about the universe beyond Earth comes from photons—visible photons from stars, xray photons from hot plasmas, radio photons from the 21‐cm hyperfine transition in hydrogen, microwave photons from the cosmic background radiation and so forth.

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References

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More about the authors

Scott Tremaine, Canadian Institute, University of Toronto.

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This Content Appeared In
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Volume 45, Number 2

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