Le Nord rencontre le Sud
En regardant cette photo, vous pourriez vous sentir un peu à l'envers ! Cette image de la semaine capture à la fois l'hémisphère nord et l'hémisphère sud - le ciel de la nuit entière dans une seule et même image, ce qui serait impossible à voir dans la vie réelle.
Pour créer cette image, les photographes Petr Horálek et Juan Carlos Casado ont pris deux photos dans des observatoires situés aux mêmes latitudes dans les hémisphères nord et sud. La moitié supérieure est une photo prise à l'observatoire Roque de los Muchachos de l'Instituto de Astrofísica de Canarias à La Palma, dans les îles Canaries, à 29 degrés au nord de l'équateur, tandis que la moitié inférieure a été prise à l'observatoire La Silla de l'ESO, dans le désert d'Atacama au Chili, à 29 degrés au sud de l'équateur. Une fois assemblées numériquement, elles créent une vue continue du ciel nocturne.
L'une des caractéristiques les plus remarquables de cette image est l'étrange lueur blanche qui rayonne verticalement à partir de son centre. Il s'agit de la lumière zodiacale, un phénomène causé par la poussière qui imprègne notre système solaire et qui disperse la lumière du soleil. Elle n'est visible que dans les régions où le ciel est extrêmement sombre et exempt de pollution lumineuse. La planète Vénus brille dans le faisceau de la lumière zodiacale de l'hémisphère nord.
L'image du bas montre plusieurs des télescopes de La Silla, dont le télescope Schmidt de 1 mètre de l'ESO au premier plan. Le miroir réfléchissant que l'on voit à l'envers sur l'image du haut fait partie du réseau Cherenkov Telescope Array (CTA), un groupe de télescopes à rayons gamma qui observent certains des phénomènes les plus énergétiques de l'univers. Un deuxième réseau sera installé dans l'hémisphère sud, près de l'Observatoire Paranal de l'ESO, grâce à un accord entre l'Observatoire CTA et l'ESO.
Liens :
Version projetée équirectangulaire de cette image
Version interactive à 360º de cette image
Version projetée sphérique de cette image
Crédit:P. Horálek & J. C. Casado / ESO
À propos de l'image
| Identification: | potw2137a |
| Langage: | fr-be |
| Type: | Photographique |
| Date de publication: | 13 septembre 2021 06:00 |
| Taille: | 15406 x 23519 px |
À propos de l'objet
| Nom: | La Silla, Milky Way, Roque de los Muchachos Observatory |
| Type: | Unspecified : Sky Phenomenon : Night Sky : Milky Way Unspecified : Technology : Observatory |
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