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Positions On Our Sky

Positions On Our Sky - The distribution of galaxies is not...

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Positions On Our Sky Galaxies are distributed fairly uniformily across the sky. Approximately the same number of galaxies are seen in every direction you look except for a narrow 5 to 10 degree band along the Milky Way's mid-plane. That narrow band, called the ``zone of avoidance'', is created by the dust in the disk. The galaxies along that line-of-sight would be visible if the dust were not there. Radio waves are not affected by the dust and radio surveys show that there are, in fact, galaxies in the direction of the Milky Way's mid-plane.
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Unformatted text preview: The distribution of galaxies is not perfectly smooth. They clump together into loose groups. If you focus on just the galaxy positions on the sky, you get just a two-dimensional picture. Finding the distances to the galaxies allows you to get a three-dimensional view of the galaxy positions. Three-dimensional maps of the universe have revealed surprisingly large structures in the universe . Galaxies like to group together and those groups, in turn, congregate together....
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