Andromeda's Globular Clusters (and hidden galaxies)

Edited Hubble Space Telescope image of a small part of the Andromeda Galaxy (M31). If you look carefully, you can spot many globular clusters, and if you look even deeper, you can see more galaxies behind Andromeda (all orange or red since the light was slowed down by dust in Andromeda, and hence is redder).

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