Explanation: Connecting the
Pipe Nebula to the colorful region near bright
star Antares is a dark cloud dubbed the
Dark River, flowing from the picture's left edge. Murky looking, the
Dark River's appearance is caused by
dustobscuring background starlight, although the dark nebula contains mostly
hydrogen and molecular gas. Surrounded by dust,
Antares, a red supergiant star, creates an unusual bright yellowish
reflection nebula. Above it, bright blue double star
Rho Ophiuchi is embedded in one of the more typical
bluish reflection nebulae, while
red emission nebulae are also scattered around the region. Globular star
cluster M4 is just seen above and right of
Antares, though it lies far behind the colorful clouds, at a distance of some 7,000 light-years. The Dark River itself is about 500
light years away.
The colorful skyscape is a mosaic of telescopic images spanning nearly 10 degrees (20 Full Moons) across the sky in the constellation of the Scorpion (Scorpius).