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Home Astronomy

Lasers reduce by star trails in lovely picture from ESO

October 1, 2023
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Lasers reduce by star trails in lovely picture from ESO
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The European Southern Observatory (ESO) shared a wonderful new picture of stars trailing throughout the night time sky. It was taken on the ESO’s Paranal Observatory, situated within the Chilean Atacama Desert. The observatory is house to the Very Massive Telescope (VLT), which consists of 4 Unit Telescopes and 4 smaller, movable Auxiliary Telescopes, just like the one within the foreground of the picture on the suitable. 

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Astronomers used a protracted publicity approach by which the night time sky is photographed over a number of hours, capturing the actions of stars as they journey overhead. This creates a stunning trailing impact, the place  starlight seems to arc over the observatory’s ground-based telescopes. 

Two shiny orange lasers are additionally seen beaming out of one of many Unit Telescopes. These laser beams, generally known as laser information stars, are used to appropriate the distortion of starlight attributable to Earth’s turbulent environment, based on a statement from the ESO. The beams are pointed in reverse instructions as a result of the lengthy publicity approach took a number of hours to finish, throughout which the telescope moved to look at completely different targets within the sky, ESO officers mentioned. 

Associated: Superb house views of ESO’s Very Massive Telescope (photographs)

A laser information star creates a synthetic star by taking pictures a laser beam into the sky, which excites sodium atoms within the higher layer of the environment and causes them to glow like stars. This, in flip, gives a reference level for ground-based telescopes, enabling them to cancel out the results of atmospheric turbulence and create a sharper picture of the sky. 

“Every laser delivers 22 watts of energy — about 4000 occasions the utmost allowed for a laser pointer — in a beam that’s about 30 centimeters in diameter,” ESO officers mentioned within the assertion. “This outstanding show doesn’t simply look fairly: the twinkling of those synthetic stars is measured in actual time and utilized by the adaptive optics system to appropriate for the blurring attributable to the Earth’s environment in order that the telescope can create sharp pictures.” 

Once we search for on the night time sky, we see stars as particular person factors of twinkling gentle. Nevertheless, the brand new picture of the star trails over ESO’s Paranal Observatory remind us of Earth’s fixed rotation, or spin, round its axis. Lengthy publicity pictures equivalent to this seize the attractive movement of the sky because the Earth rotates relative to the backdrop of stars.  



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