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. This thin pall of material is known as the circumgalactic medium, a halo so vast it contains some 70 percent of the galaxy's visible mass.
A new investigation of a single galaxy roughly 270 million light years away has revealed interactions between the circumgalactic medium and the galaxy's radiant disc that help define a boundary, one that suggests our own galaxy could stretch farther than we imagined.with the Andromeda galaxy may have already commenced – at least in terms of the two circumgalactic mediums beginning to intersect.
Some of the field's images featured the thread of neutral hydrogen gas connecting IRAS08 with an even smaller neighbor via the cosmic web, so it's little surprise that the team measured plenty of hydrogen drifting about in the vacuum. Using the spectral data in the scattering of images, the researchers mapped changes in the density of ionization on a scale of a few thousand light years, identifying a gently fading zone of influence by IRAS08's own starlight.
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