Did you know telescopes beam lasers into the sky to simulate the appearance of a star?

This 'fake' star is used to understand how the atmosphere makes thing "twinkle" in real-time, and once you understand that, you can correct your images

Must-see graphically illustrated thread https://twitter.com/astro_jcm/status/1248640837086560257

Ohhh and if you want to see what specifically the before and after might look like...look here https://twitter.com/j_bertolotti/status/1144525775242182658?s=19