An Interacting Colossus: Galaxies NGC 6872 & IC 4970 | Hubble
From tip to tip, NGC 6872 measures over 500,000 light-years across, making it the second largest spiral galaxy discovered to date. In terms of size it is beaten only by NGC 262, a galaxy that measures a mind-boggling 1.3 million light-years in diameter! To put that into perspective, our own galaxy, the Milky Way, measures between 100,000 and 120,000 light-years across, making NGC 6872 about five times its size.
The upper left spiral arm of NGC 6872 is visibly distorted and is populated by star-forming regions, which appear blue on this image. This may have been be caused by IC 4970 recently passing through this arm—although here, recent means 130 million years ago! Astronomers have noted that NGC 6872 seems to be relatively sparse in terms of free hydrogen, which is the basis material for new stars, meaning that if it were not for its interactions with IC 4970, NGC 6872 might not have been able to produce new bursts of star formation.
A version of this image was entered into the Hubble’s Hidden Treasures image processing competition by contestant Judy Schmidt.
Image Credit: European Space Agency (ESA)/Hubble & NASA
Acknowledgement: Judy Schmidt (geckzilla.com)
Release Date: Sept. 15, 2014
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