NASA / ESA / HUBBLE / STSCI / SCIENCE PHOTO LIBRARY NASA / ESA / HUBBLE / STSCI / SCIENCE PHOTO LIBRARY
Irregular galaxy NGC 4861, Hubble Space Telescope (HST) image. This dwarf irregular galaxy is a candidate for a phenomenon known as a 'galactic wind'. Smaller galaxies are more likely to have outflows of fast charged particles known as galactic winds, powered by the ongoing process of star formation. New stars are forming in the bright, colourful 'head' of NGC 4861 (lower left) and ejecting streams of high-speed particles. This galaxy is 30 million light years from Earth, in the constellation of Canes Venatici. This optical image was obtained by the HST's Advanced Camera for Surveys (ACS) and Wide Field Camera 3 (WFC3). Image published in 2017.
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