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Medusa nebula, Abell 21

[Medusa Nebula]

About this image

The Medusa nebula, known scientifically as Abell 21, is an old planetary nebula some 1,500 light-years away in the constellation Gemini. It is estimated to be over 4 light-years across. This image was taken on Oct 24th, 2008 at the Mayall telescope with the mosaic camera, with [OIII] (assigned a blue color) and H-alpha (orange) filters

This image was released during the 100 Hours of Astronomy webcast, "Around the World in 80 Telescopes" held from April 3-4, 2009, during the International Year of Astronomy 2009. View the recorded event from KPNO. See also this image of NGC 6520 from CTIO, which was also released during the webcast.

More: nebulae page, planetary nebulae page.


Minimum credit line: H. Schweiker/NOAO/AURA/NSF and T. A. Rector/University of Alaska Anchorage and NOAO/AURA/NSF

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1000 x 997 493 KB color JPG
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4000 x 3986 6.37 MB color JPG
8333 x 8304 52.98 MB color JPG
8333 x 8304 198.01 MB color TIFF
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