Image Credit & Copyright: Tom O'Donoghue
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
dustclouds block starlight and so
appear dark.
Antares, a
red supergiant and one of the
brighter stars in the night sky, lights up the yellow-red clouds on the lower center.
Rho Ophiuchi lies at the center of the blue nebula near the top. The distant
globular cluster M4 is visible just to the right of
Antares, and to the lower left of the red cloud engulfing
Sigma Scorpii. These star clouds are even more
colorful than humans can see, emitting light across the
electromagnetic spectrum.
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