NASA / ESA / STSCI / SCIENCE PHOTO LIBRARY NASA / ESA / STSCI / SCIENCE PHOTO LIBRARY
Dwarf galaxy NGC 4449. Hubble Space Telescope image of the dwarf galaxy NGC 4449 during a starburst, a time of intense star formation (red areas). It is thought this activity was triggered by NGC 4449 merging or interacting with a smaller companion galaxy. Image taken by the Advanced Camera for Surveys.
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