**Astronomy Picture of the Day**

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Kind-1 (TextNote)

2026-03-11T04:23:33Z

Astronomy Picture of the Day

11 March 2026

Sky Glows over Paranal Observatory

https://apod.nasa.gov/apod/image/2603/TeleSkyLasers_Looten_1080.jpg

Image Credit: Julien Looten

Explanation:
Are lasers from giant telescopes being used to defend the Earth?

No.

Lasers shot from telescopes are now commonly used to help increase the accuracy of astronomical observations.

In some directions, Earth atmosphere-induced fluctuations in starlight can indicate how the air mass over a telescope is changing, but in other directions, no bright star exists.

In these directions, astronomers can create an artificial star with a laser.

Subsequent observations of the artificial laser guide star can reveal information so detailed about the changing blurring effects of the Earth's atmosphere that much of it can be removed by rapidly flexing a telescope's mirror.

Such adaptive optics techniques allow high-resolution ground-based observations of real stars, planets, and nebulas.

Pictured here, telescopes at Paranal Observatory in Chile study a colorful sky filled with green airglow and the Magellanic Clouds on the left, red airglow on the right, and the majestic central band of our Milky Way Galaxy arching across the center.

#APOD #ParanalObservatory #LaserGuideStar #AdaptiveOptics #Telescope #Astronomy

https://apod.nasa.gov/apod/ap260310.html

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  "content": "**Astronomy Picture of the Day**\n\n11 March 2026\n\n**Sky Glows over Paranal Observatory**\n\nhttps://apod.nasa.gov/apod/image/2603/TeleSkyLasers_Looten_1080.jpg\n\nImage Credit: Julien Looten\n\nExplanation:  \nAre lasers from giant telescopes being used to defend the Earth? \n\nNo. \n\nLasers shot \nfrom telescopes are now commonly used to help increase the accuracy of astronomical observations. \n\nIn some directions, Earth atmosphere-induced \nfluctuations in starlight can indicate how the \nair mass over a \ntelescope is changing, but in other directions, no bright star exists. \n\nIn these directions, astronomers can create an \nartificial star with a \nlaser. \n\nSubsequent observations of the artificial \nlaser guide star can reveal information so detailed \nabout the changing blurring effects of the \nEarth's atmosphere that much of it \ncan be removed by rapidly flexing a telescope's mirror. \n\nSuch adaptive optics techniques allow high-resolution ground-based observations of \nreal stars, \nplanets, and \nnebulas. \n\nPictured here, telescopes at \nParanal\nObservatory in \nChile \nstudy a colorful sky filled with green \nairglow and the \nMagellanic Clouds on the left, red \nairglow on the right, \nand the majestic central band of our \nMilky Way Galaxy \narching across the center.\n\n#APOD #ParanalObservatory #LaserGuideStar #AdaptiveOptics #Telescope #Astronomy\n\nhttps://apod.nasa.gov/apod/ap260310.html\n",
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