|NGC 5351 and NGC 5349 float together at around 100 million light years away. Astronomers found that the radio emissions of HI (redshifted 21cm line) surrounding NGC 5351 extend about 1.4 times the size of the galaxy that is seen in the optical wavelengths of light. Astronomers can use this information to determine the mass of a galaxy (in terms of its luminous and "dark" constituents).|
|L R G B color production was used to create this image.||
Minimum credit line: Teresa Hawes and Philip Darling/Adam Block/NOAO/AURA/NSF
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