The technology behind the astronomy

The technical and engineering achievement behind the astronomical images and discoveries produced by scientists using ESO facilities is exceptionally marvelous. Here we see the fourth Unit Telescope (Yepun) of ESO’s Very Large Telescope (VLT) in Chile, which hosts several advanced instruments, such as MUSE, HAWK-I and ERIS

These instruments, engineered to study the mysteries of the Universe, such as planets, stellar nurseries, and supermassive black holes, would never be able to do so without the Adaptive Optics Facility (AOF). One of the components of the AOF is the 4 Laser Guide Star Facility (4LGSF). The lasers are emitted from the four black tubes seen in this image around the telescope’s 8.2-m mirror. Each laser beam is 30 centimeters wide and carries 22 watts of power! As the lasers reach about 90 kilometers into Earth’s atmosphere, they excite sodium atoms, making them glow, just like a star.

Special sensors in each instrument measure the twinkling of these artificial stars in real time. Instructions are sent to the telescope’s deformable secondary mirror, which reshapes at millisecond speeds. This counteracts atmospheric turbulence, delivering crystal clear images.

Crédit:

À propos de l'image

Identification:potw2301a
Type:Photographique
Date de publication:2 janvier 2023 06:00
Taille:5723 x 3808 px

À propos de l'objet

Nom:VLT Unit Telescopes
Type:Unspecified : Technology : Observatory : Telescope
Catégorie:Paranal

Formats des images

Grand JPEG
6,1 Mio
JPEG taille écran
398,1 Kio

Zoomable


Fonds d'écran

1024x768
446,3 Kio
1280x1024
654,2 Kio
1600x1200
893,8 Kio
1920x1200
1,0 Mio
2048x1536
1,3 Mio