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Résultats de la recherche
Saturne
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Légende : La caméra à grand champ 3 du télescope spatial Hubble de la NASA/ESA a observé Saturne le 20 juin 2019, alors que la planète s'approchait au plus près de la Terre, à une distance d'environ 1,36 milliard de kilomètres. L'image montre des bandes colorées de gaz à la surface de la planète ainsi que ses anneaux proéminents composés de glace et de matériaux rocheux.
Crédit : NASA, ESA, A. Simon (Goddard Space Flight Center), et M.H. Wong (Université de Californie, Berkeley)
Lien du crédit
Termes du glossaire:
Géantes gazeuses , Planète géante , Planètes extérieures , Anneau , Saturne
Catégories :
Système solaire
Licence : Creative Commons (CC) Attribution 4.0 International (CC BY 4.0) Creative Commons (CC) Attribution 4.0 International (CC BY 4.0) Icônes
Fichier
( image
262.21 kB)
Lift-off of Apollo 11 on a Saturn V rocket
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Légende : The Apollo 11 Saturn V Space vehicle lifts off with Astronauts Neil A. Armstrong, Michael Collins and Edwin E. Aldrin, Jr., at 9:32 a.m. local time on July 16, 1969, from Launch Complex 39A at NASA's Kennedy Space Center, for the first Moon landing.
Crédit : NASA
Lien du crédit
Termes du glossaire:
Apollo , Lune
Catégories :
Exploration spatiale
Licence : Domaine Public Domaine Public Icônes
Fichier
( image
11.91 MB)
Equatorial Milky Way
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Créé pour l'OAE
Légende : Honourable mention in the 2022 IAU OAE Astrophotography Contest, category Still images of celestial patterns: Equatorial Milky Way
Taken in Bromo-Tengger-Semeru National Park, Java Island, Indonesia, in March 2016, this image captures regions of the southern Milky Way and, at its left edge, the two planets Mars and Saturn. Mars appears orange and is similar in colour to the star Antares, whose Greek name — anti Ares — references this. Saturn is a little bit fainter than Mars, but clearly visible among the stars of Ophiuchus, above the Pipe Nebula and forming an isosceles triangle with Mars and Antares.
Mars is on the top and Saturn is vertically below. Visible to the naked eye, both planets have significance in many cultures around the world. In Roman mythology Mars is the god of war and fertility, and Saturn the god of sowing and agriculture. Its Greek equivalent, the god Kronos, is also considered the regent of completion. Indigenous Australians, including the Kamilaroi and Wailan people, associate Saturn with “wunygal”, a small bird. Mars is called Iherm-penh (something burnt in flames) by the Anmatyerre people of the Central Desert, while the Kokatha people of the Western Desert associate Mars and the star Anatres with the red-tailed black cockatoo (Kogolongo).
In the middle of this photograph, the most famous southern constellations are clearly recognisable: the Southern Cross (Crux), the pointer stars, Alpha and Beta Centauri, the dark Coalsack Nebula and the red Eta Carina Nebula, which is not visible to the unaided eye but is prominent in modern photographs. In the 19th century, the star eta Carinae had been the second-brightest star in the sky for some time, but since it varies irregularly, it has hardly been recognisable in recent decades, and its future visibility is unpredictable.
Triangulum Australe is visible between the pointer stars and the Scorpion, and in the constellation of Centaurus, the bright globular star cluster Omega Centauri is clearly displayed. It was considered a “nebulous star” since antiquity and, thus, was listed in star catalogues for at least 2000 years. Only within the last century did astronomers discover that globular star clusters are in the halo of our galaxy and that this one consists of roughly 10 million stars.
The dark regions in the Milky Way, which are cool, dense clouds of dust and gas, form the head and body of the Celestial Emu Tchingal. Together with the Southern Cross and the pointer stars, they appear in the Dreamtime stories of many Indigenous Australians. One story associated with the Djab Wurrung and the Jardwadjali people is part of a Dreamtime Story involving Tchingal, the Bram-bram-bult brothers (the pointer stars), their mother Druk (Delta Crux), and Bunya the hunter, who gets transformed into a possum (Gacrux, the red star at the top of the Southern Cross).
Crédit : Giorgia Hofer/IAU OAE
Termes du glossaire:
Poussière , Mars , Voie lactée , Saturne , Scorpius , Croix du Sud , Nuage de poussière , L'extinction interstellaire , Alpha du Centaure
Catégories :
Voie lactée et milieu interstellaire
, Astronomie à l'œil nu
Licence : Creative Commons (CC) Attribution 4.0 International (CC BY 4.0) Creative Commons (CC) Attribution 4.0 International (CC BY 4.0) Icônes
Ce fichier est sur Zenodo ( image 1.61 MB)
Flowing Night Sky
vidéo
Créé pour l'OAE
Légende : Honourable mention in the 2022 IAU OAE Astrophotography Contest, category Time lapses of celestial patterns.
This time-lapse was shot from Slovakia in August 2020. By fixing the relative movement of the sky to Earth's rotation in some of the frames, we can experience a different perspective as a viewer.
The Milky Way, our home galaxy, is visible throughout the whole video. The bright objects near the Milky Way are Jupiter and Saturn, close together, Jupiter being the brighter one.
This video also shows the interaction of amateur astronomers observing the Perseids meteor shower with their telescopes pointed towards the sky. An unfortunate aspect of the art of astronomical observing, clouds can suddenly cover the whole sky. The fog occurs mostly because of the higher humidity after the rain.
Most of the light trails in the sky are made by satellites, but some of them, appearing just very briefly and not very noticeably, are meteors, as the video was shot around the peak of Perseids meteor shower.
Crédit : Robert Barsa/IAU OAE
Termes du glossaire:
Jupiter , Voie lactée , Saturne , Étoile filante
Catégories :
Voie lactée et milieu interstellaire
, Astronomie à l'œil nu
, Étoiles
Licence : Creative Commons (CC) Attribution 4.0 International (CC BY 4.0) Creative Commons (CC) Attribution 4.0 International (CC BY 4.0) Icônes
Ce fichier est sur Zenodo ( vidéo 254.11 MB)
Rhea reappearing after occultation by Titan
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Légende : On October 27, 2009, NASA’s Cassini spacecraft orbiting around Saturn captured this view of Saturn's moon Rhea as it began to emerge after being hidden by Saturn's largest moon Titan during an occultation. An occultation is a celestial event in which one object moves in front of another and temporarily blocks the first object from view.
In this image, Titan — about 5,150 km across — was closer to the spacecraft at about 1 million km, while Rhea — roughly 1,528 km in diameter — was farther away at about 2.3 million km. Titan’s high-altitude atmospheric haze is visible as a faint glow around its limb, showing the difference in surface and atmospheric properties between these two moons.
Scientists study occultations like this because watching how one moon disappears behind or reappears from another helps refine our understanding of their orbits and physical characteristics.
Crédit : NASA/JPL/Space Science Institute
Lien du crédit
Termes du glossaire:
Lunes , Titan , Occultation
Licence : Domaine Public Domaine Public Icônes
Fichier
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85.73 kB)
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