Tag Archives: Antares

How come the sky near the star Antares and the Rho Ophiuchi cloud complex is so dusty and colourful? Who hasn’t wondered that? No one hasn’t. To wit:

The colours 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 left of the featured image. Rho Ophiuchi lies at the center of the blue nebula near the top. The distant globular cluster M4 is visible to the right of Antares. These star clouds are even more colorful than humans can see, emitting light across the electromagnetic spectrum.

(ImageDavid McGarvey)

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