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The Milky Way's Missing Mass: Partially Found

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Magellanic Clouds

As the Large and Small Magellanic Clouds orbit the Milky Wayand each otherthey shed their gas (shown in pink) into our galaxy's halo. Click here to enlarge.

Credit: David Nidever et al., NRAO/AUI/NSF and Meilinger, Leiden-Argentine-Bonn Survey, Parkes Observatory, Westerbork Observatory, Arecibo Observatory / Amanda Montaez

Giant galaxies such as the Milky Way and Andromeda consist mostly of exotic dark matter.

From Scientific American
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