This color comes from the hot hydrogen gas which is excited to shine by the hottest stars which have just formed within the nebula. However, the brightest region is actually of white color, not overexposed as one might think. This phenomenon is apparently a result of a mixture of emission light from the hottest gas, together with reflections of the bright star light from the dust in this region. The nebula contains a large amount of dark obscuring material, which is obvious in its remarkable features. This matter has been heated by the hidden young stars, and shines brightly in infrared light.
This nebula is about 5000 & 6000 lys far from us, look at the red point:
I recognize the way that we can find it by the Altair at Aquila, is it clear ? I dont know that why the quality of the picture decrease when I uploaded ! here is some sketches about this nebula that I find it at Wikipedia, Consider :
I find another Sketch that is drawn by Mr Phil Harrington at Astronomy.com, let's see it :
all the sketches are different, but they have some similarities, could you find out? that's right the horseshoe-shaped , and these are the real images :
In the Center of Omega Nebula (2004 February 8 APOD)
2002 December 10 APOD
2000 September 19 APOD
at the below link is so many another Images that is taken by amateurs :
Click here
and :
RA :18h 20m 26s
Dec :−16° 10′ 36″
Sources : Sky Atlas Observer
wikipedia
Apod
seds.org
