M20 & M21 - Nebula & Open Cluster


M20 at right, also known as Triffid Nebula, is both an emission and reflection nebula, accounting for its red and blue hues. M21 is an open cluster of stars. This image taken on 21 August 2008 with a William Optics 80mm FD and .8 FF/reducer; SBIG ST2000XCM camera. Made on a Mac: Captured using Equinox Image. Processed using Nebulosity 2.0, Photoshop CS3 and OSX Preview.

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