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![WorldAndScience Avatar](https://lunarcrush.com/gi/w:24/cr:twitter::511402689.png) World and Science [@WorldAndScience](/creator/twitter/WorldAndScience) on x 2.6M followers
Created: 2025-07-20 10:22:07 UTC

Fascinating: VLT Adaptive Optics

Laser beams are sent into the atmosphere where they cause sodium particles to glow, creating artificial ‘stars’ used to measure the blurring effects caused by Earth’s atmosphere, which are then corrected by a telescope

Credit: ESO/G. Hüdepohl

![](https://pbs.twimg.com/media/GwSzeTfXAAAZiQo.jpg)

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**Related Topics**
[artificial](/topic/artificial)

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