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Satellite Galaxies Live In The Same Plane As Their Hosts, Defying Dark Matter Predictions

8 Feb 2018, 15:01 UTC
Satellite Galaxies Live In The Same Plane As Their Hosts, Defying Dark Matter Predictions ESO/WFI (Optical); MPIfR/ESO/APEX/A.Weiss et al. (Submillimetre); NASA/CXC/CfA/R.Kraft et al. (X-ray)

Dark matter is one of the most powerful, yet one of the most controversial, ideas to come about in modern physics. We see indisputable evidence that the normal matter present in the Universe, made up of protons, neutrons, and electrons, cannot explain the full suite of gravitational effects on their own. Adding an additional source of mass with particular properties, i.e., dark matter, brings almost all of gravitation’s predictions in line with what we see. Yet one of dark matter’s predictions is that small, dwarf, satellite galaxies should form in a large halo around large galaxies. Yet around the Milky Way, Andromeda, and now Centaurus A, they don’t live in a halo, but rather, a disk. The researchers doing the latest study claim this is a major challenge to the standard picture of cold dark matter (CDM) cosmology. But is it, really? Finding out requires an in-depth look.

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