Colorful Clouds Near Rho Ophiuchi . ... Credit Copyright: Markus Noller ( Deep-Sky-Images ) Explanation: Why is the sky near Antares and Rho Ophiuchi so colorful? ... Fine dust illuminated from the front by starlight produces blue reflection nebulae . ... Antares , a red supergiant and one of the brighter stars in the night sky , lights up the yellow-red clouds on the lower center of the featured image . Rho Ophiuchi lies at the center of the blue nebula on the left. ... NASA Official: Jay Norris. ...