© Marcin Rosadziński
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© Marcin Rosadziński

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Orion at Cowcowing Lakes, Western Australia
Nikon d810a - 50mm - ISO 3200 - f/2 Foreground: 8 x 20 seconds Sky: 20 x 25 seconds Ha: 8 x 60 seconds iOptron SkyTracker
Barnard's Loop, Orion
Barnard's Loop
It's likely you'll be fairly familiar with the constellation of Orion in the night's sky, whether you view it from the Northern or Southern Hemisphere it's easily identifiable by the 3 stars, the belt of Orion, with Betelgeuse and Rigel, large bright stars either side of it.
The human eyes can even detect a fuzzy area just below the three stars, M42 Orion Nebula, best seen by not looking directly at it, but just off to the side in what we call Averted Vision.
But what our eyes cannot see, is that Orion is covered in a huge nebulous region of hydrogen gas, it's only 1,500 light years from us, making it the closest star forming area to Earth.
In the top image, you can see the extent of the gas and dust, stretching far beyond the belt of Orion, and forming what appears to be a loop like structure, known as Barnard's loop.
Astronomers have long argued how such a loop was created in the first instance, but recent evidence appears to point towards a "recent" supernova, 4 million years ago in a cluster of stars known as OBP-B1.
You can see a visualisation of the area here which lets you zoom in and out.
It gives you a small indication of the power of supernova, carving out huge voids in hydrogen gas, creating bubbles, but also shock waves as the pressure pushes out against the gas, and in doing so, creating clumps and areas where future stars can be born.
Source :
Astronomers have mapped Orion in 3D to understand the origin of the large arc of Barnard’s Loop — and you can interact with the 3D image!
Barnard's Loop
An emission nebula in the constellation of Orion 1,600 light years away.

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From Astronomy Picture of the Day; October 14, 2018:
Orion in Red and Blue David Lindemann
When did Orion become so flashy? This colorful rendition of part of the constellation of Orion comes from red light emitted by hydrogen and sulfur (SII), and blue-green light emitted by oxygen (OIII). Hues on the featured image were then digitally reassigned to be indicative of their elemental origins -- but also striking to the human eye. The breathtaking composite was painstakingly composed from hundreds of images which took nearly 200 hours to collect. Pictured, Barnard's Loop, across the image bottom, appears to cradle interstellar constructs including the intricate Orion Nebula seen just right of center. The Flame Nebula can also be quickly located, but it takes a careful eye to identify the slight indentation of the dark Horsehead Nebula. As to Orion's flashiness -- a leading explanation for the origin of Barnard's Loop is a supernova blast that occurred about two million years ago.
Orion constellation
Imaged from ESO's La Silla Observatory, this photograph brilliantly captures the full Orion constellation and arcs of gas and dust weaving through the constellation. Just to the left of the the Hunter's three-star belt is the bright Orion Nebula, one of the most well known star-forming regions. Credit: Zdenek Bardon/ESO
all nebulae are gay and they’re all my girlfriend