|Filamentary Hα emission in Cygnus, observed as
part of the INT WFC Northern Galactic Plane photometric Hα survey (IPHAS).
The colour scheme is red for Ha, blue for the Sloan r' band, and green for
Sloan i' band. As this is a significantly reddened region, as well as nebulous,
there are many stars coming through strongly in the i' band, appearing here
as a background of green stars. Colour image courtesy of Mike and Jonathan
Irwin (IoA, Cambridge). For more information see the article by Janet Drew et al. on page 3. [ JPEG | TIFF ]