... The Dark River to Antares . ... Credit Copyright: Jason Jennings 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 dust obscuring background starlight, although the dark nebula contains mostly hydrogen and molecular gas. ... Publications with keywords: Antares - dust . Publications with words: Antares - dust . ...