Parade de planètes sur l'Opéra de Sydney
Levez les yeux vers le ciel cette semaine et observez une belle brochette de planètes. Juste après le coucher du soleil, en regardant vers l'ouest (principalement), les planètes Mercure, Vénus, Saturne et Jupiter seront toutes visibles à l'oeil nu simultanément. Si vous disposez d'un télescope, vous pourrez également observer les planètes Uranus et Neptune. En partant de l'horizon, l'alignement sera cette semaine le suivant : Vénus (la plus brillante), Mercure, Saturne, Neptune, Uranus et Jupiter (la deuxième plus brillante). Peu importe où vous vivez sur Terre, car ce défilé planétaire en début de soirée sera visible dans un ciel dégagé partout dans le monde. Les planètes sembleront presque alignées, car elles orbitent toutes autour du Soleil dans un plan presque identique : l'écliptique. Cette image montre un défilé planétaire similaire qui s'est produit en 2022, capturé au-dessus de l'Opéra de Sydney, dans le sud de l'Australie. Bien qu'elles soient visibles toute la semaine, les planètes seront plus facilement observables ensemble ce week-end.
L'image d'astronomie du jour (Astronomy Picture Of the Day - APOD)
Traduction réalisée par Didier Jamet
D'autres images d'astronomie...
19 janvier 2021
Couronne lunaire avec Jupiter et Saturne
Cet effet, appelé couronne lunaire, est dû à la diffraction de la lumière par les gouttelettes d'un nuage d'altitude si mince qu'il en est presque transparent.
14 novembre 2023
Le pic des trois planètes
Dans l'obscurité déclinante qui précède l'aube, un triangle semble se tenir en équilibre au sommet d'une formation rocheuse à la pointe sud de la Sicile.
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Uranus - NASA Science
Planet Uranus Overview Uranus is a very cold and windy planet. It is surrounded by faint rings, and more than two dozen small moons as it rotates at a nearly 90-degree angle from the plane of its orbit. This unique tilt makes Uranus appear to spin on its side. Uranus is blue-green in color due […]
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Venus - NASA Science
Planet Venus Overview Venus is a cloud-swaddled planet named for a love goddess, and often called Earth’s twin. But pull up a bit closer, and Venus turns hellish. Our nearest planetary neighbor, the second planet from the Sun, has a surface hot enough to melt lead. The atmosphere is so thick that, from the surface, […]
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