The Omega (AKA Swan, Lobster Horseshoe or Checkmark) Nebula was
discovered by Philippe de Cheseaux in 1745. Our man Messier catalogued
it in 1764
The Omega Nebula is some 5,000 to 6,000 light-years from earth. It has
a diameter of approx 15 light-years, however, that is the smaller
area. The entire araa that you see here spans some 40
light-years. Wikipedia, says thatit is considered one of the
brightest and most massive star-forming regions in the Milky Way.
The biggest difference between this nebula and the Orion Nebula is that
we are looking at this one edge-on rather than face-on.