Messier 20


This image shows the Trifid Nebula M20, a cloud of gas surrounding a star-forming region. It is a 3-color composite of 3 black-and-white photographic plates taken with the 3.9-meter Anglo Australian Telescope and different emulsions and filters, exposed as follows: Blue 35 minutes on Kodak IIa-O with GG 385 filter, Green 30 minutes on IIa-D/GG 495, Red 30 minutes on 098-04/OG 610. Its components, an ionized red emission nebula 40 light-yeras in diameter, and a blue reflection nebula are nicely visible, together with an appealing system of conspicuous dark nebulae, obscuring the light from regions behind them.

This image is copyrighted and may be used for private purpose only. For any other kind of use, including internet mirroring and storing on CD-ROM, please contact the Photo Permissions Department of the Anglo Australian Observatory.

  • More information on this image by David Malin
  • Hi-res version of this image [171k JPG]

  • Unsharp masked and enhanced version of the same image

    Hartmut Frommert (
    Christine Kronberg (

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    Last Modification: 19 Apr 1998 19:40 MET