SH2-235 is considered to be caused by the collision of two vast molecular clouds. The collision has triggered a great amount of star formation that is only seen in deep dust-penetrating infrared light. I've seen it called the "Brain Nebula". It is about 1800 light-years away by some estimates. http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996ApJ...463..630H&link_type=ARTICLE&db_key=AST&high=

The faint H alpha seen in the upper left corner is a very small part of SH2-232. Even fainter tendrils from SH2-231 can be seen coming in from the right. They, along with SH2-233 way off to the right of my image are all part of the same complex per the cited paper.

14" LX200R @ f/10, L=8x10' RGB=3x10'x3, STL-11000XM, Paramount ME