|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
Gaseous clouds whose atoms are excited by ultraviolet starlight produce
reddish emission nebulae.
Backlit dust clouds block starlight and so
a red supergiant and one of the brighter stars in the night sky,
lights up the yellow-red clouds on the lower center.
lies at the center of the blue nebula near the top.
The distant globular cluster
M4 is visible just to the right of
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.
Credit & Copyright: