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An enormous halo of hot gas (in blue) around the Milky Way galaxy with a radius of at least 300,000 light years.
Künstlerische Darstellung des Halos aus heißem Gas, der die Milchstraße umgibt. Neben der Milchstraße sind auch die große und die kleine Magellansche Wolke zu sehen, unsere beiden Begleitgalaxien (Bild: Illustration: NASA/CXC/M.Weiss; NASA/CXC/Ohio State/A Gupta et al )
Astronomers have used Chandra to find evidence that our Milky Way Galaxy is embedded in an enormous halo of hot gas that extends for hundreds of thousands of light years. This artist’s illustration shows the halo of hot gas, in blue, around the Milky Way and two small neighboring galaxies. The mass of the halo is estimated to be comparable to the mass of all the stars in the Milky Way galaxy. If the size and mass of this gas halo is confirmed, it could be the solution to the “missing-baryon” problem for the Galaxy.