Hubble Reveals a River of Star Formation

This newly revised NASA Hubble Space Telescope image of the Hickson Compact Group 31 (HCG 31) of galaxies 

 The bright, distorted clump of young blue-white stars is NGC 1741.

 NGC 1741 is actually a pair of colliding dwarf galaxies

HGC 31’s fourth member is revealed by a stream of young blue stars that point to the galaxy

Dwarf galaxy encounters are normally seen billions of light-years away, and therefore occurred billions of years ago

 HCG 31 is located some 166 million light-years from Earth,

The color blue represents visible blue light and showcases young, hot, blue stars

 while the color red represents near-infrared light

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