6.7.15

Astronomy picture of the day - 2015 July 6 - Colorful Clouds Near Rho Ophiuchi

2015 July 6
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Colorful Clouds Near Rho Ophiuchi 
Image Credit & Copyright: Markus Noller (Deep-Sky-Images)
Explanation: Why is the sky near Antares and Rho Ophiuchi so colorful? The colors result from a mixture of objects and processes. Fine dust illuminated from the front by starlight produces blue reflection nebulae. Gaseous clouds whose atoms are excited by ultraviolet starlight produce reddish emission nebulae. Backlit dust clouds block starlight and so appear darkAntares, 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 imageRho Ophiuchi lies at the center of the blue nebula on the left. The distant globular cluster M4 is visible to the upper right of center. These star clouds are even more colorful than humans can see, emitting light across the electromagnetic spectrum.

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