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Galaxies’ missing matter may be found – but now there’s too much of it

The spiral galaxy M99, imaged by the Hubble Space Telescope

ESA/Hubble & NASA, M. Kasliwal

Many large galaxies were long thought to be missing a huge proportion of matter – but it’s now been found, and that’s an even bigger problem for our understanding of the universe.

Observations over the course of the last decade or so have shown that galaxies about the size of the Milky Wayappear to have far less baryonic matter – meaning normal matter, not dark matter – than we expect. This expectation is based on the ratio of dark matter to regular matter …

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