Into the vortex

This week’s picture may just hypnotise you! Resembling a vortex or an optical illusion, the starry circles draw you deeper into this breathtaking mountainous landscape of Chile’s Atacama Desert, home to ESO's La Silla Observatory.

Each circular streak represents an individual star which maps out a star trail. Such trails are due to Earth’s rotation, which causes the stars to seemingly move across the sky, slowly tracing out perfect rings centred on the south celestial pole as they do so. A photograph like this therefore requires a long exposure to capture the passage of time. 

La Silla is located some 2400 metres above sea level, and offers perfect observing conditions for long-exposure shots like this; the site experiences over 300 clear nights a year! 

Here, ESO operates two of the most productive 4-metre class telescopes in the world: the ESO 3.6-metre telescope which is home to the world's foremost extrasolar planet hunter, the High Accuracy Radial velocity Planet Searcher (HARPS), and the 3.58-metre New Technology Telescope (NTT), which played a key role in the development of active optics, a technique that paved the way for building even larger telescopes.

Kilde:

Zdeněk Bardon (bardon.cz)/ESO

Om bildet

ID:potw2150a
Type:Foto
Publiseringsdato:13. desember 2021 06:00
Størrelse:5000 x 3277 px

Om objektet

Navn:La Silla, Star Trails
Type:Unspecified : Sky Phenomenon : Night Sky : Trail
Unspecified : Technology : Observatory
Kategori:La Silla

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