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This image shows a rare alignment between two spiral galaxies. The outer rim of a small, foreground galaxy is silhouetted against a larger background galaxy. Dust lanes can be seen extending beyond the small galaxy's disk of starlight. Such outer dusty structures are rarely visible in a galaxy because there is usually nothing behind to illuminate them.

CREDIT: NASA, ESA, and The Hubble Heritage Team (STScI/AURA). Acknowledgment: B. Holwerda (Space Telescope Science Institute) and J. Dalcanton (University of Washington).

Source:
http://hubblesite.org/newscenter/archive/releases/2008/33/image/a/