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The Lagoon is the larger nebula at the bottom. The red color arises mainly from hydrogen gas. The smaller Trifid at the top is also an emission nebula, but it has reflection components, which are regions of sparse fine dust that reflect the blue light of the stars. The dark veins in the Trifid are related lanes of cool gas in the foreground.

  • Objects: Lagoon, Trifid and NGC 6559 Nebulae in Sagittarius
  • Distance: 5,000 light years
  • Width of Lagoon: 90 light years
  • Exposure: 90 minutes @ f/6.7
  • Telescope: Astro-Physics 130 EDF
  • Mount: Astro-Physics 600E QMD, pier
  • Guiding: SBIG ST-4 @ 700mm
  • Camera: Pentax 67
  • Film: hypered Kodak PPF 400
  • Location: Pearce, AZ
  • Date: 24-May-01 00:38 MST
  • Conditions: transparency 7/10, seeing 6/10, LVM 7.0, 57° F
  • Processing: UMAX PowerLook 3000, Adobe Photoshop 6.0.1

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