Science News

Curated by RSF Research Staff

Finding the Milky Way’s Hydrogen Halo

The mass of a galaxy is made up of both baryonic matter and dark matter. Based on the current understanding of dark matter, from cosmic microwave background data, scientists have a good idea of how much dark matter should make up a galactic mass. However, when all the observed mass - coming from baryonic matter – is added together it only accounts for half of what is expected.

Now recent analysis of galactic observations by scientists from the University of Arizona have detected what they believe to be the hydrogen halo of the Milky way galaxy. The determined mass is the same as all the stars, galactic bulge and matter in the galaxy and thus accounts for the missing baryonic matter.


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