Skip to comments.Astronomy Picture of the Day -- Pickering's Triangle in the Veil
Posted on 09/16/2015 11:18:14 PM PDT by SunkenCiv
Explanation: Chaotic in appearance, these filaments of shocked, glowing gas break across planet Earth's sky toward the constellation of Cygnus, as part of the Veil Nebula. The Veil Nebula itself is a large supernova remnant, an expanding cloud born of the death explosion of a massive star. Light from the original supernova explosion likely reached Earth over 5,000 years ago. Blasted out in the cataclysmic event, the interstellar shock waves plow through space sweeping up and exciting interstellar material. The glowing filaments are really more like long ripples in a sheet seen almost edge on, remarkably well separated into the glow of ionized hydrogen and sulfur atoms shown in red and green, and oxygen in blue hues. Also known as the Cygnus Loop, the Veil Nebula now spans nearly 3 degrees or about 6 times the diameter of the full Moon. While that translates to over 70 light-years at its estimated distance of 1,500 light-years, this field of view spans less than one third that distance. Identified as Pickering's Triangle for a director of Harvard College Observatory and cataloged as NGC 6979, the complex of filaments might be more appropriately known as Williamina Fleming's Triangular Wisp.
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[Credit and Copyright: J-P Metsävainio (Astro Anarchy)]
for the ping, later.
Since this weekend marks the 20th anniversary of the launch of the Hubble telescope, I thought it would be worthwhile to explain the false-colour images taken by the Hubbles cameras why theyre in false colour, what the colours represent, and how its done.
False-colour astrophotography is not unique to Hubble; its used at observatories on the ground around the world, and by professional and amateur astronomers alike. I could do it myself, down the road. So heres my best stab at explaining it. ...
see link for his explanation...
In order of increasing temperature, we have: red, orange, yellow, white, and blue. This can actually be observed in the flame on your stove at home. Where the flame first comes out of the jets it is hottest (blue). As the flames stretches out into the air, it cools to red and orange. -etl
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