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You are here: Home / Science / One Neighboring Galaxy Is a Bright Smear Across Space

One Neighboring Galaxy Is a Bright Smear Across Space

June 15, 2015 By Ellen Smith

The sphere surrounding the Milky Way is called the Local Volume, and it is 35 million lightyears in diameter. In the Local Volume is PGC 18431, a galaxy the Hubble caught as part of a mission to figure out how galaxies cluster and move.

Hubble’s high resolution allows astronomers to explore star populations within these moderately distant galaxies — specifically, stars known as tip of the red giant branch stars — in order to get an idea of the galaxy’s composition and, crucially, its distance from us. Knowing galactic distances enables us to accurately map a galaxy sample in three dimensions, a method key to understanding more about our cosmic neighbors, and to dismiss perspective and line-of-sight illusions.

Source: io9 One Neighboring Galaxy Is a Bright Smear Across Space  | Author at katharine@io9.com. Image: European Space Agency/NASA/Hubble

Filed Under: Science

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