#vlt — Public Fediverse posts on home.social

earthling @[email protected] · 2026-05-13 · 11:53 UTC

3/

Measuring the Blur: Because the telescope "knows" exactly what that laser star should look like (a perfect point of light), it can measure how the atmosphere is currently distorting it.

The Shape-Shifting Mirror: This data is sent to a deformable mirror inside the telescope. This mirror has hundreds of tiny actuators behind it that adjust its shape thousands of times per second to perfectly cancel out the atmospheric turbulence.

#MilkyWay
#Chile
#VLT
#lasers
#astronomy

#milkyway #chile #vlt #lasers #astronomy

earthling @[email protected] · 2026-05-13 · 11:51 UTC

2/
How the "tuning" works:

The VLT uses a technology called Adaptive Optics to fix this in real-time:

Creating the Reference: The lasers are fired 90 kilometers up into a layer of the atmosphere rich in sodium atoms. The laser light excites these atoms, making them glow and creating an "artificial star" exactly where the telescope is looking.

#astrophotography
#MilkyWay
#Chile
#VLT
#lasers
#astronomy

#astrophotography #milkyway #chile #vlt #lasers #astronomy

earthling @[email protected] · 2026-05-13 · 11:50 UTC

You can think of those lasers as the "tuning fork" for the telescope's optical system.

Even in a place as clear as the Atacama, our atmosphere isn't perfectly still. Pockets of warm and cool air act like moving lenses, bending light and causing that "twinkling" effect we see in stars. While it's pretty for us, it’s a nightmare for astronomers because it blurs the fine details of distant galaxies.

#astrophotography
#MilkyWay
#Chile
#VLT
#lasers

#astrophotography #milkyway #chile #vlt #lasers

earthling @[email protected] · 2026-05-13 · 11:47 UTC

Sodium Milky Way

This scene was captured at the Very Large Telescope (VLT) on Cerro Paranal, in Chile’s Atacama desert, under exceptionally pure observing conditions where the boundary between Earth and sky feels almost seamless. Situated at 2,635 metres above sea level, the site benefits from extremely dry conditions, stable atmospheric layers and minimal light pollution, resulting in more than 300 clear nights each year.

Julien Looten

#astrophotography
#MilkyWay
#AltText
#Chile
#VLT

#astrophotography #milkyway #alttext #chile #vlt

Anthony Horton @[email protected] · 2026-05-12 · 04:16 UTC

A fun detail in that photo of the two Lego telescope models in my previous post: that's the Very Large Telescope sitting on the right Nasmyth instrument platform of the Extremely Large Telescope. The two models are built to approximately the same scale, a VLT Unit Telescope (without its dome) really would fit on the instrument platform of the ELT, the jump in scale from the current generation of telescopes to the next is just that big.

I'm 2024 I was lucky enough to be able to photograph the ELT from the VLT and vice versa, enabling me to make a size comparison of my own: https://aus.social/@spacelizard/113185149611957251

#Astrodon #Astronomy #ELT #VLT #ESO #Telescope

#astrodon #astronomy #elt #vlt #eso #telescope

Anthony Horton @[email protected] · 2026-05-12 · 04:16 UTC

A fun detail in that photo of the two Lego telescope models in my previous post: that's the Very Large Telescope sitting on the right Nasmyth instrument platform of the Extremely Large Telescope. The two models are built to approximately the same scale, a VLT Unit Telescope (without its dome) really would fit on the instrument platform of the ELT, the jump in scale from the current generation of telescopes to the next is just that big.

I'm 2024 I was lucky enough to be able to photograph the ELT from the VLT and vice versa, enabling me to make a size comparison of my own: https://aus.social/@spacelizard/113185149611957251

#Astrodon #Astronomy #ELT #VLT #ESO #Telescope

#astrodon #astronomy #elt #vlt #eso #telescope

Anthony Horton @[email protected] · 2026-05-12 · 04:16 UTC

A fun detail in that photo of the two Lego telescope models in my previous post: that's the Very Large Telescope sitting on the right Nasmyth instrument platform of the Extremely Large Telescope. The two models are built to approximately the same scale, a VLT Unit Telescope (without its dome) really would fit on the instrument platform of the ELT, the jump in scale from the current generation of telescopes to the next is just that big.

I'm 2024 I was lucky enough to be able to photograph the ELT from the VLT and vice versa, enabling me to make a size comparison of my own: https://aus.social/@spacelizard/113185149611957251

#Astrodon #Astronomy #ELT #VLT #ESO #Telescope

#astrodon #astronomy #elt #vlt #eso #telescope

Anthony Horton @[email protected] · 2026-05-12 · 04:16 UTC

A fun detail in that photo of the two Lego telescope models in my previous post: that's the Very Large Telescope sitting on the right Nasmyth instrument platform of the Extremely Large Telescope. The two models are built to approximately the same scale, a VLT Unit Telescope (without its dome) really would fit on the instrument platform of the ELT, the jump in scale from the current generation of telescopes to the next is just that big.

I'm 2024 I was lucky enough to be able to photograph the ELT from the VLT and vice versa, enabling me to make a size comparison of my own: https://aus.social/@spacelizard/113185149611957251

#Astrodon #Astronomy #ELT #VLT #ESO #Telescope

#telescope #eso #vlt #elt #astronomy #astrodon

Anthony Horton @[email protected] · 2026-05-12 · 04:16 UTC

A fun detail in that photo of the two Lego telescope models in my previous post: that's the Very Large Telescope sitting on the right Nasmyth instrument platform of the Extremely Large Telescope. The two models are built to approximately the same scale, a VLT Unit Telescope (without its dome) really would fit on the instrument platform of the ELT, the jump in scale from the current generation of telescopes to the next is just that big.

I'm 2024 I was lucky enough to be able to photograph the ELT from the VLT and vice versa, enabling me to make a size comparison of my own: https://aus.social/@spacelizard/113185149611957251

#Astrodon #Astronomy #ELT #VLT #ESO #Telescope

#astrodon #astronomy #elt #vlt #eso #telescope

Anthony Horton @[email protected] · 2026-05-12 · 03:53 UTC