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Astronomy Picture of the Day
Posted By Editor On November 16, 2011 @ 7:33 am In Photo Essays | Comments Disabled
Within the nebula, bright edges and dark shapes are highlighted in this colorful skyscape. The image includes data from narrowband filters, mapping emission from atomic oxygen, hydrogen, and sulfur into blue, green, and red hues.
Explanation: Hot, young stars and cosmic pillars of gas and dust seem to crowd into NGC 7822. At the edge of a giant molecular cloud  toward the northern constellation Cepheus , the glowing star forming region lies about 3,000 light-years away. Within the nebula, bright edges and dark shapes are highlighted in this colorful skyscape . The image includes data from narrowband  filters, mapping emission from atomic oxygen, hydrogen, and sulfur into blue, green, and red hues. The atomic emission is powered by  energetic radiation from the hot stars, whose powerful winds and radiation also sculpt and erode the denser pillar shapes. Stars could still be forming inside the pillars  by gravitational collapse , but as the pillars are eroded away, any forming stars will ultimately be cutoff from their reservoir of star stuff . This field spans around 40 light-years at the estimated distance of NGC 7822.
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URL to article: http://www.berthoudrecorder.com/astronomy-picture-of-the-day-89/
URLs in this post:
 Image: http://nightsky.at/Photo/Neb/NGC7822_WN.html
 Copyright: http://apod.nasa.gov/apod/lib/about_apod.html#srapply
 Manuel Fernández Suarez: http://www.elfirmamento.com/
 molecular cloud: http://archive.ncsa.illinois.edu/Cyberia/Bima/GMC.html
 constellation Cepheus: http://www.astropix.com/HTML/E_SUM_N/CEPHEUSO.HTM
 colorful skyscape: http://www.elfirmamento.com/galeria/n_band/page/NGC7822_1000.html
 narrowband: http://apod.nasa.gov/apod/ap060324.html
 powered by: http://apod.nasa.gov/apod/ap051223.html
 inside the pillars: http://apod.nasa.gov/apod/ap020104.html
 gravitational collapse: http://hyperphysics.phy-astr.gsu.edu/hbase/astro/gravc.html#c1
 star stuff: http://hubblesite.org/newscenter/archive/releases/1995/44/image/a/
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