Dark Matter and Dark Energy: The Critical Questions

Details Dark Matter and Dark Energy: The Critical Questions Dark Matter and Dark Energy: The Critical Questions

2002-07-14

arxiv.org/abs/astro-ph/0207297v1

Astronomy and Astrophysics

Astrophysics

10 pages LaTeX (newpasp.sty). To appear in "Hubble's Science Legacy: Future Optical-Ultraviolet Astronomy from Space", eds. K.

Scientific paper

Stars account for only about 0.5% of the content of the Universe; the bulk of the Universe is optically dark. The dark side of the Universe is comprised of: at least 0.1% light neutrinos; 3.5% +/- 1% baryons; 29% +/- 4% cold dark matter; and 66% +/- 6% dark energy. Now that we have characterized the dark side of the Universe, the challenge is to understand it. The critical questions are: (1) What form do the dark baryons take? (2) What is (are) the constituent(s) of the cold dark matter? (3) What is the nature of the mysterious dark energy that is causing the Universe to speed up.

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