Nord møder Syd
Ugens billede kan godt gøre een lidt svimmel! Her er på samme tid både den nordlige og den sydlige himmelhalvkugle - altså hele nattehimlen i et lidt forvirrende billede, og noget, som ikke ville kunne ses fra jordoverfladen i virkeligheden.
Billedet er sammensat af to optagelser, hvor himmelfotograferne Petr Horálek og Juan Carlos Casado fotograferede fra hver sit sted med samme breddegrad henholdsvis nord og syd for ækvator. Øverste del af billedet er optaget på Instituto de Astrofísica de Canarias observatorium Roque de los Muchachos på øen La Palma i den canariske øgruppe 29° nord for ækvator, og det nederste er fra ESOs La Silla Observatorium i Chiles Atacamaørken, 29° syd for ækvator. Når de sættes sammen digitalt får vi et sammenhængende blik på nattehimlen.
En af de mest bemærkelsesværdige detaljer i billedet er det underlige hvide skær, som stråler lodret ud fra centrum. Det er zodiacalyset, som skyldes støv ude i Solsystemets plan, som spreder Solens lys. Det er et fænomen, som kun kan ses fra områder, hvor himlen er meget mørk og fri for lysforurening. Det klare lys i den nordlige del af zodiakallyset er planeten Venus.
Det nederste billede viser flere af teleskoperne på La Sille, blandt andre ESO 1-metre Schmidt teleskopet i forgrunden. Spejlet, som ses på hovedet i det øverste billede hører til Cherenkov Telescope Array (CTA). Det er en klynge af gammastråleteleskoper, som observerer nogle af de mest energirige fænomener i Universet. En anden klynge teleskoper bliver opstillet på den sydlige halvkugle tæt ved ESOs Paranalobservatorium, som en følge af en aftale imellem CTA Observatory og ESO.
Kilde:P. Horálek & J. C. Casado / ESO
Om billedet
| Id: | potw2137a |
| Sprog: | da |
| Type: | Foto |
| Udgivelsesdato: | 13. september 2021 06:00 |
| Størrelse: | 15406 x 23519 px |
Om objektet
| Navn: | La Silla, Milky Way, Roque de los Muchachos Observatory |
| Type: | Unspecified : Sky Phenomenon : Night Sky : Milky Way Unspecified : Technology : Observatory |
Billedformater
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