VLT's adaptive optics at work

One of the major enemies of astronomers is the Earth’s atmosphere, which makes celestial objects appear blurry when observed by ground-based telescopes. To counteract this, astronomers use a technique called adaptive optics, in which computer-controlled deformable mirrors are adjusted hundreds of times per second to correct for the distortion of the atmosphere.

This spectacular image shows one of the four 8.2-metre Unit Telescope of ESO’s Very Large Telescope (VLT) facility, launching a powerful yellow laser beam into the sky. The beam creates a glowing spot — an artificial star — in the Earth’s atmosphere by exciting a layer of sodium atoms at an altitude of 90 km. This Laser Guide Star (LGS) is part of the VLT’s adaptive optics system. The light coming back from the artificial star is used as a reference to control the deformable mirrors and remove the effects of atmospheric distortions, producing astronomical images almost as sharp as if the telescope were in space.

Припис:

ESO

Про зображення

ID:uhd_01_aec_48
Тип:Фотографічне
Дата релізу [date]:22 січня 2014 р. 16:07
Розмір:4256 x 2832 px

Про об’єкт

Назва:Cerro Paranal, Paranal, Very Large Telescope
Тип:Unspecified : Technology : Observatory : Telescope
Категорія:Paranal

Формати зображень


Масштаб


Шпалери

1024x768
250,0 Кб
1280x1024
398,7 Кб
1600x1200
547,1 Кб
1920x1200
628,2 Кб
2048x1536
835,1 Кб