A new, recently revised image of the Hickson Compact Group 31 (HCG 31) taken by space
Another dwarf galaxy to the right of the pairconnected by a thin blue stream of stars that creates a cosmic trio. The fourth member of HGC 31 is shown as a stream of young blue stars that indicate the galaxy (lower left of center) and its interaction with the other three. The bright object in the center of the image is a star located between Earth and HCG 31.
Image credit: NASA, ESA and J. Charlton (Pennsylvania State University);
Image Processing: G. Kober (NASA Goddard/Catholic University of America)
Collisions with dwarf galaxies are commonare observed billions of light years away and therefore occurred billions of years ago. However, HCG 31 is located approximately 166 million light-years from Earth, which is unusually close to Earth by cosmic standards. The newly revised image highlights star-forming regions caused by the objects' gravitational interactions. The blue color represents young, hot blue stars, and the red color represents light in the near-infrared.
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