A Dim Galaxy


UGC 695 is located 30 million light-years away within the constellation Cetus. It’s a low-surface-brightness galaxy. LSB galaxies are so faint that their brightness is less than the nighttime background brightness of Earth’s atmosphere, making them nearly impossible to observe. This image was taken by the Hubble Space Telescope. Their low brightness is the result of the relatively small number of stars in them—most of the matter in these galaxies is in huge clouds of gas and dust. Thus, LSB galaxies have a high fraction of dark matter relative to the number of stars they contain.

Image Credit: NASA / ESA

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