Astronomy (Q71225): Difference between revisions
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Latest revision as of 18:03, 7 July 2025
scientific study of celestial objects and phenomena
- Astronomical
| Language | Label | Description | Also known as |
|---|---|---|---|
| English | Astronomy |
scientific study of celestial objects and phenomena |
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Statements
Laser Towards Milky Ways Centre.jpg
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4,000 × 3,631; 10.3 MB
In mid-August 2010 ESO Photo Ambassador Yuri Beletsky snapped this photo at ESO’s Paranal Observatory, Chile. A group of astronomers were observing the centre of the Milky Way using the laser guide star facility at Yepun, one of the four Unit Telescopes of the Very Large Telescope (VLT). Yepun’s laser beam crosses the southern sky and creates an artificial star at an altitude of 90 km high in the Earth's mesosphere. The Laser Guide Star (LGS) is part of the VLT’s adaptive optics system and is used as a reference to correct the blurring effect of the atmosphere on images. The colour of the laser is precisely tuned to energise a layer of sodium atoms found in one of the upper layers of the atmosphere — one can recognise the familiar colour of sodium street lamps in the colour of the laser. (English)
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