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PICTURE OF THE DAY

Omega Centauri (NGC 5139) is the undisputed king of globular clusters.

Omega Centauri

Omega Centauri (NGC 5139) is the undisputed king of globular clusters. Originally labeled a star, later observers saw its true nature. Today, astronomers tell us that it contains more than 1 million stars. (4-inch Stellarvue SVQ100 refractor, SBIG STL-11000 CCD camera, LRGB image with five 5-minute exposures through each filter)

IMAGING BASICS see all »

ISON_Nov15_Peach

Catch Comet ISON with your camera

Be ready to photograph this special celestial visitor with these expert tips.
The Leo Trio

2010 Astroimaging Contest: Deep-sky category entrants

Nebulae dominated the category, but the winner is a beautiful trio of galaxies.
The Milky Way

2010 Astroimaging Contest: General category entrants

Image entries ranged from star trails to solar halos, but the category winner is a stunning Milky Way composite.
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