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Galaxy Holmberg IX

The irregular dwarf galaxy Holmberg IX, a satellite of M 81, is visible almost only in ultraviolet light. This is, because it largely consists of young, hot, blue stars.

Constellation: Ursa Major
Distance: 12 million light-years
Visual magnitude: 16.5
Type: dI

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    Holmberg IX
Holmberg IX above M 81, picture in UV-light.
Photo: NASA, JPL-Caltech, Galex Team, J. Huchra et al. (Harvard CfA)

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