IC 4592: The Blue Horsehead Reflection Nebula . ... The main part of the above imaged molecular cloud complex is a reflection nebula cataloged as IC 4592 . Reflection nebulas are actually made up of very fine dust that normally appears dark but can look quite blue when reflecting the light of energetic nearby stars. ... A second reflection nebula dubbed IC 4601 is visible surrounding two stars on the upper right of the image center. ... NASA Web Site Statements, Warnings, and Disclaimers . ...