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Summary
| Description |
Afrikaans: Sterrekundiges op die perseel van die Baie Groot Teleskoop (BGT) in Chili probeer om die veranderende vorm van die Aarde se atmosfeer te bepaal. Die emisies van atome wat met hierdie geel laserstraal in die bolaag van die atmosfeer gestimuleer word, skep die beeld van 'n kunsmatige ster, en deurlopende aftasting van hierdie ligdata stel sterrekundiges in staat om atmosferiese distorsie onmiddellik te meet. Die resultate word deurgevoer na 'n teleskoopspieël van die BGT wat gelyktydig effens vervorm word om hierdie distorsie teë te werk. In hierdie geval het die BGT die sentrum van ons eie sterrestelsel waargeneem, en kennis van die Aarde se atmosferiese distorsie is in daardie rigting benodig. Die laserstraal is kwalik sigbaar vir die blote oog, maar danksy die lang beligtingstyd staan dit duidelik uit.
English: Astronomers at the Very Large Telescope (VLT) site in Chile are trying to measure the distortions of Earth's ever changing atmosphere. Constant imaging of high-altitude atoms excited by the laser which appears like an artificial star allow astronomers to instantly measure atmospheric blurring. This information is fed back to a VLT telescope mirror which is then slightly deformed to minimize this blurring. In this case, a VLT was observing our Galaxy's centre, and so Earth's atmospheric blurring in that direction was needed. The beam is almost invisible to the naked eye. The photograph was taken over a period of time thereby making the beam visible.
Français : Des astronomes tentent de mesurer les distorsions de l'instable atmosphère terrestre au VLT (Very Large Telescope), Chili. Ile parviennent à mesurer quasi-instantanément le flou atmosphérique en observant continuellement des atomes de haute altitude excités par un laser. L'information est transmise à un miroir du VLT, qui est alors déformé finement pour minimiser le flou. Ici, le VLT observait le centre de notre galaxie, nécessitant donc le dé-floutage dans la direction observée. Le rayon est quasi-invisible à l’œil nu. La photo a été prise sur une longue durée, rendant le rayon visible. |
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| Date | |||||
| Source | NASA Astronomy Picture of the Day | ||||
| Author | Yuri Beletsky | ||||
| Permission (Reusing this file) |
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This file, which was originally posted to
NASA Astronomy Picture of the Day, was reviewed on 8 June 2020 by reviewer Acagastya, who confirmed that it was available there under the stated license on that date.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 09:01, 24 September 2009 | | 3,888 × 2,596 (3.23 MB) | Cropbot | upload cropped version, operated by User:Originalwana. Summary: cropped |
| 22:11, 16 August 2009 |  | 3,888 × 3,163 (7.12 MB) | Originalwana | {{Information |Description={{en|1=Astronomers at the Very Large Telescope (VLT) site in Chile are trying to measure the distortions of Earth's ever changing atmosphere. Constant imaging of high-altitude atoms excited by the laser which appears like an art |
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