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21 Aug, 2019
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File:The Colors Of The Night Sky.jpg

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	18:23, 22 June 2023		7,000 × 6,629 (13.11 MB)	C messier	full size
	19:57, 29 March 2023		1,280 × 1,212 (414 KB)	Yiseth Romero	Uploaded a work by CTIO/NOIRLab/NSF/AURA/B. Tafreshi from https://noirlab.edu/public/images/iotw2226a/ with UploadWizard

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Cerro Tololo Inter-American Observatory

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Author	Babak Tafreshi
Copyright holder	Babak Tafreshi btafreshi@twanight.org
ISO speed rating	6,400
Credit/Provider	CTIO/NOIRLab/NSF/AURA/B. Tafreshi
Source	NSF's NOIRLab
Online copyright statement	www.twanight.org
Image title	A remarkable array of colors is visible in the night sky over Cerro Tololo Inter-American Observatory (CTIO), a Program of NSF’s NOIRLab, in this image. We tend to assume that the night sky should be inky black and punctuated by stars, although it is rarely visible in cities and other highly-populated areas because of light pollution from artificial, man-made light. Interestingly, however, the night sky is not actually pitch black in the absence of light pollution. It instead reveals a beautiful array of subtle colors that arise from various phenomena. Most of the color in this image is due to red and green airglow, which is the term used to describe the slight brightening of the night sky caused by chemical reactions taking place in Earth’s atmosphere.
Short title	The Colors of the Night Sky
Usage terms	Creative Commons Attribution 4.0 International License
Date and time of data generation	12:00, 29 June 2022
JPEG file comment	A remarkable array of colors is visible in the night sky over Cerro Tololo Inter-American Observatory (CTIO), a Program of NSF’s NOIRLab, in this image. We tend to assume that the night sky should be inky black and punctuated by stars, although it is rarely visible in cities and other highly-populated areas because of light pollution from artificial, man-made light. Interestingly, however, the night sky is not actually pitch black in the absence of light pollution. It instead reveals a beautiful array of subtle colors that arise from various phenomena. Most of the color in this image is due to red and green airglow, which is the term used to describe the slight brightening of the night sky caused by chemical reactions taking place in Earth’s atmosphere.
Software used	Adobe Photoshop 23.0 (Windows)
File change date and time	22:46, 5 December 2021
Date and time of digitizing	09:36, 18 July 2015
Date metadata was last modified	23:46, 5 December 2021
Unique ID of original document	xmp.did:a9020e96-b0af-0a4a-aaed-124fc25bdcad
Copyright status	Copyrighted
Contact information	https://noirlab.edu 950 North Cherry Ave. Tucson, AZ, 85719 USA
Country shown	Chile
Province or state shown	Elqui Valley
Sublocation of city shown	Cerro_Tololo_Inter-American_Observatory
IIM version	4

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