Dust lanes in the Pinwheel galaxy. The dust particles scatter blue light the most and therefore colour the light from background stars red. The same effect is seen in sunsets on the Earth.

Credit:

Image: European Space Agency & NASA

Acknowledgements:

Project Investigators for the original Hubble data: K.D. Kuntz (GSFC), F. Bresolin (University of Hawaii), J. Trauger (JPL), J. Mould (NOAO), and Y.-H. Chu (University of Illinois, Urbana)

Image processing: Davide De Martin (ESA/Hubble)

CFHT image: Canada-France-Hawaii Telescope/J.-C. Cuillandre/Coelum

NOAO image: George Jacoby, Bruce Bohannan, Mark Hanna/NOAO/AURA/NSF