May 16
Hickson Compact Group 90
Observed in 2006
These three galaxies, called NGC 7173 (middle left), NGC 7174 (middle right) and NGC 7176 (lower right), are part of Hickson Compact Group 90, named after astronomer Paul Hickson, who cataloged small groups of galaxies like this one.
Image credit: NASA, ESA, Hubble Space Telescope