After a discussion on <a href="http://en.wikipedia.org/wiki/Str%c3%b6mgren_sphere" rel="nofollow">Strömgren spheres</a> and all the little H-alpha bubbles in the Triangulum galaxy over at <a href="http://asterisk.apod.com/viewtopic.php?f=9&t=32666" rel="nofollow">Asterisk</a>, I became interested in processing some of the archived data on NGC 604, which is actually an enormous complex of hydrogen clouds in M33 (Triangulum Galaxy).

I confess that the data is somewhat Franken'ed together because I wanted a slightly wider view of the object and slightly less of those awkward polygons of missing data. There are still a few blank triangles but I think the result is ok despite them.

Red: hst_05773_03_wfpc2_f656n_wf_sci + hst_05237_02_wfpc2_f656n_wf_sci Green: hst_05237_02_wfpc2_f555w_wf_sci + hst_05773_03_wfpc2_f547m_wf_sci Blue: hst_05237_02_wfpc2_f336w_wf_sci + hst_05773_03_wfpc2_f502n_wf_sci