by APOD Robot » Tue Aug 27, 2019 4:09 am
Dark Dust and Colorful Clouds near Antares
Explanation: Why is the sky near
Antares and
Rho Ophiuchi so dusty yet 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 dark.
Antares, 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.
[url=https://apod.nasa.gov/apod/ap190827.html] [img]https://apod.nasa.gov/apod/calendar/S_190827.jpg[/img] [size=150]Dark Dust and Colorful Clouds near Antares[/size][/url]
[b] Explanation: [/b] Why is the sky near [url=https://en.wikipedia.org/wiki/Antares]Antares[/url] and [url=http://en.wikipedia.org/wiki/Rho_Ophiuchi_cloud_complex]Rho Ophiuchi[/url] so dusty yet colorful? The colors result from a mixture of objects and processes. Fine dust illuminated from the front by starlight produces blue [url=https://apod.nasa.gov/apod/ap031229.html]reflection nebulae[/url]. Gaseous clouds whose atoms are excited by [url=https://science.nasa.gov/ems/10_ultravioletwaves]ultraviolet[/url] starlight produce reddish [url=https://apod.nasa.gov/apod/ap120214.html]emission nebulae[/url]. Backlit [url=https://apod.nasa.gov/apod/ap030706.html]dust[/url] clouds block starlight and so [url=https://apod.nasa.gov/apod/ap120129.html]appear dark[/url]. [url=http://stars.astro.illinois.edu/sow/antares.html]Antares[/url], a [url=http://hyperphysics.phy-astr.gsu.edu/hbase/astro/redsup.html]red supergiant[/url] and one of the [url=http://www.astro.wisc.edu/~dolan/constellations/extra/brightest.html]brighter stars in the night sky[/url], lights up the yellow-red clouds on the lower left of the featured image. [url=https://apod.nasa.gov/apod/ap100524.html]Rho Ophiuchi[/url] lies at the center of the blue nebula near the top. The distant [url=https://apod.nasa.gov/apod/globular_clusters.html]globular cluster[/url] [url=https://apod.nasa.gov/apod/ap000523.html]M4[/url] is visible to the right of Antares. These star clouds are even more [url=https://www.nasa.gov/audience/forkids/kidsclub/flash/clubhouse/Color_NASA.html]colorful[/url] than humans can see, emitting light across the [url=https://science.nasa.gov/ems/01_intro]electromagnetic spectrum[/url].
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