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Résultats de la recherche
Haus der Astronomie
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Légende : Haus der Astronomie in early 2019
Crédit : HdA
Fichier ( image 247.43 kB)
The Pillars of Creation in comparison
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Légende : The 'Pillars of Creation' are a renowned astronomical feature situated within the Eagle Nebula in the Serpens constellation. The illustration provides a direct comparison between images captured by the Hubble Space Telescope (HST) and the James Webb Space Telescope (JWST), showcasing the pillars, which span several light years in diameter, in both visible light (also known as optical light) and infrared light. On the left are the pillars as seen by Hubble in visual light, taken in 2014. It displays dark pillars against an opaque background, with only a handful of visible stars. Conversely, the counterpart on the right is Webb’s near-infrared view published in 2022, penetrating the dust and revealing numerous stars of varying sizes.
Their distance from Earth is approximately 6,500 to 7,000 light years. Within these pillars, new stars are constantly forming, making them a subject of extensive study by astronomers. Composed mostly of cool molecular hydrogen and small amounts of interstellar dust, they are subject to erosion by the intense ultraviolet radiation emitted by nearby massive and newborn stars, a process known as photoevaporation.
Crédit : NASA, ESA, CSA, STScI
Lien du crédit
Termes du glossaire:
Astronomie infrarouge , Télescope infrarouge , Astronomie optique , Formation des étoiles , Spectre visible , Nuage de poussière
Catégories :
Voie lactée et milieu interstellaire
, Étoiles
Licence : Creative Commons (CC) Attribution 2.0 Générique Creative Commons (CC) Attribution 2.0 Générique Icônes
Fichier
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12.03 MB)
SOFIA: Unveiling the Infrared Universe from the Skies
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Légende : This image shows the Stratospheric Observatory for Infrared Astronomy (SOFIA) telescope. This telescope which operated from 2010 to 2022 was mounted in a modified Boeing 747 aircraft with a section of the rear fuselage removed to allow the telescope to observe the sky and with other modifications that allow it to fly at a higher altitude than a standard 747.
Many molecules which are common in the Earth's atmosphere (such as water, carbon dioxide and methane) absorb radiation at infrared wavelengths. This interferes with infrared observations made from the ground. SOFIA flew at an altitude that puts it above most of the water vapour in the Earth's atmosphere, greatly reducing the impact of absorption by water molecules on its observations.
Crédit : NASA photo / Jim Ross
Lien du crédit
Termes du glossaire:
Astronomie infrarouge , Télescope infrarouge
Licence : Domaine Public Domaine Public Icônes
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1.76 MB)
WISE Survey Capturing the Whole Sky in Infrared Light
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Légende : This image presents the entire sky mapped in infrared light from space by the WISE satellite. While dust in the plane of the Milky Way blocks visible light, obscuring the heart of our Galaxy, infrared light passes through the dust. The most prominent feature is the broad, bright band running horizontally through the centre — this is the plane of our Milky Way galaxy. Numerous brighter knots and patches appear above and below the band, marking regions of active star formation and nearby galaxies.
Such a dataset is a classic example of an astronomical survey, in which large portions of the sky is scanned to build a comprehensive catalogue of cosmic sources. The WISE satellite operated in space, allowing it to study parts of the infrared spectrum blocked by Earth's atmosphere.
Crédit : NASA/JPL-Caltech
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Termes du glossaire:
Astronomie infrarouge , Relevé astronomique
Licence : Domaine Public Domaine Public Icônes
Fichier
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64.59 MB)
Télescope spatial Hubble en orbite terrestre
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Légende : Le télescope spatial Hubble de la NASA/ESA en orbite autour de la Terre. Cette photo a été prise par les astronautes à bord de la navette spatiale Columbia, juste après une mission d'entretien du télescope. Il possède une ouverture laissant entrer la lumière (vue ici à gauche). La lumière traverse l'optique jusqu'aux caméras et aux spectrographes situés à l'autre extrémité (ici à droite). Les données de ces instruments sont ensuite envoyées vers la Terre à l'aide d'une antenne. Les rectangles noirs situés de part et d'autre du télescope sont les panneaux solaires qui l'alimentent en énergie.
Crédit : NASA/ESA
Lien du crédit
Termes du glossaire:
Astronomie infrarouge , Observatoire , Astronomie optique , Télescope spatial
Catégories :
Télescopes, instruments et observatoires
Licence : Creative Commons (CC) Attribution 4.0 International (CC BY 4.0) Creative Commons (CC) Attribution 4.0 International (CC BY 4.0) Icônes
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1.31 MB)
