Nebulae - Glittering Lights - Marco Lorenzi
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Barnard's Loop

Barnard's Loop

Why is the Horsehead Nebula surrounded by a bubble? Although hard to make out, the famous Horsehead Nebula is the slight dark indentation in the bright streak just to the right of the image center. Glowing like an emission nebula, the origin of the bubble, known as Barnard's Loop, is currently unknown. Progenitor hypotheses include the winds from bright Orion stars and the supernovas of stars long gone. Barnard's Loop is too faint to be identified with the unaided eye. The nebula was discovered only in 1895 by E. E. Barnard on long duration film exposures. The above image was taken through RGB filters and improved by data coming from hydrogen filtered light to bring out detail. To the left of the Horsehead Nebula, visible as a small dark indentation, is the photogenic Flame Nebula while close to the right upper corner is shining the famous M42 nebula (text adapted from APOD). Mosaic of two frames collecting a total of 16 hours of light

Pentax 67 EDIF 300mm f/4 - FLI Proline 16803 - Ha (240m) R (180m) G (320m) B (240m) - Warrumbungle Observatory, Coonabarabran, NSW, Australia

Barnard loopOrionM42horseheadIC434M78