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A series of light and dark rings that resemble an archery target around the star TW Hydrae

Planet formation around the star TW Hydrae

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Légende : This image shows the disk around the young star TW Hydrae. This star is only about 10 million years old, young enough that planets are still forming in a disk of gas and dust around it. This image was created using an array of submillimetre telescopes, each of which looks like a satellite dish. The signals from these telescopes were combined by a central processing computer to make this image. The lighter and darker patches show areas of the disk where there is more or less dust respectively. The dark rings and bright rings are evidence that the dust in the disk has been shepherded into some orbits and away from others. This is likely because there is one or more planets that are still forming hidden in the disk. The whole image shows the disk around TW Hydrae out to a distance of about 70 astronomical units frm the central star. The two outer dark rings are separated from the central star by approximately the average distance between the Sun and Uranus and the average distance between the Sun and Pluto. The inner central hole appears to have been carved out by a planet orbiting TW Hydrae at a distance similar to the distance between the Earth and the Sun.
Crédit : S. Andrews (Harvard-Smithsonian CfA); B. Saxton (NRAO/AUI/NSF); ALMA (ESO/NAOJ/NRAO)
Lien du crédit

Termes du glossaire: Formation de planètes
Catégories : Exoplanètes et astrobiologie

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 210.48 kB)

A bright oval with a dark circle in the center. To the right of the dark circle but still inside the oval is a bright dot.

The planet PDS 70b inside a protoplanetary disk

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Légende : An image of the planet PDS 70b. The young star PDS 70b has a protoplanetary disk surrounding it. Disks like these contains gas, fine sandy particles that astronomers refer to as dust and also larger bodies ranging from objects the size of pebbles to protoplanets (planets that are still forming). This image was taken in infrared light using adaptive optics. Adaptive optics is a technique that uses flexible mirrors and computer analysis to remove the blurring effect of the Earth's atmosphere. This allows astronomers to search regions close to stars like PDS 70 that would otherwise be swamped by light from the star spread out by the Earth's atmosphere. In the center is a black circle. This is caused by a coronograph, a small circle that blocks out light from the parent star. This is surrounded by a bright oval, infrared light emitted from the material in the protoplanetary disk. To the right of the black circle covering the star is a bright dot. This is PDS 70b, a giant planet that is still forming .
Crédit : ESO/ A. Müller, MPIA
Lien du crédit

Termes du glossaire: Formation de planètes , Protoplanète , Disque protoplanétaire , Optique adaptative
Catégories : Exoplanètes et astrobiologie

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 1.59 MB)

A map with the red prime meridian line running through London & crossing the darker horizontal equator in the Gulf of Guinea.

The Prime Meridian

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Légende : The prime meridian is defined as zero degrees longitude and runs from the North Pole through Greenwich in London to the South Pole. It is represented as a bright red line on this schematic Earth map. The horizontal line corresponds to the equator, while the antimeridian itself forms the outer edges at 180 degrees to the west and east.
Crédit : Wikicommons user Kmf164
Lien du crédit

Termes du glossaire: Équateur , Méridien principal
Catégories : Planète Terre

Licence : Domaine Public Domaine Public Icônes

Fichier ( image 563.81 kB)

Timelapses of rotating skies behind trees, telescopes, mountains and observatories

The Rotating Planet

vidéo
Créé pour l'OAE

Légende : Second place winner in the 2023 IAU OAE Astrophotography Contest, category of Time-lapses of rotation of Big Dipper or Southern Cross. A cosmic journey unfolds across continents in this time-lapse video which captures both iconic constellations from diverse corners of the world. Starting in China, the Big Dipper graces the night sky, a steadfast guide embedded in cultural narratives. Its luminance marks the beginning of this celestial odyssey. The two pointer stars on the end of the Big Dipper point to the North Star (Polaris) which appears to remain stationary as the sky rotates. From Nepal’s lofty peaks, the Big Dipper’s familiarity persists, a reliable fixture in the shifting panorama of the rotating planet. Moving to Chile, the Southern Cross adorns the firmament, emblematic of the southern skies. Frames from Chile showcase this constellation accompanied by the Milky Way Galaxy. In Namibia, a telescope from the H.E.S.S. Observatory appears in the video. Later, nestled beneath sheltering trees, the Big Dipper persists in its celestial prominence, appearing against a canvas of stars. Using varied techniques — fisheye lenses, static cameras, and Earth's movement-tracking — each frame unveils the Cross’s grandeur against diverse landscapes. These sequences — marked by star trails and Earth’s rotation—highlight the enduring presence of the Big Dipper and Southern Cross, bridging cultures and celestial beauty across hemispheres.
Crédit : Jianfeng Dai/IAU OAE (CC BY 4.0)

Termes du glossaire: Grande Ourse , Pôle céleste , Sphère Céleste , La rotation de la Terre , Pôle céleste nord (PCN) , Polaris , Croix du Sud , Pôle céleste sud (PCS)
Catégories : Astronomie à l'œil nu
Mots clés : astrophotography

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 863.53 MB)

La planète Vénus montrant les nuages blancs qui l'enveloppent

Vénus en lumière visible

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Légende : Cette photo prise par la sonde Mariner 10 de la NASA montre à quoi ressemble la planète Vénus lorsqu'on l'observe à l'œil nu. Vénus est enveloppée d'une épaisse atmosphère nuageuse dominée par le dioxyde de carbone, qui ne laisse jamais apparaître sa surface brûlante.
Crédit : NASA/JPL-Caltech
Lien du crédit

Termes du glossaire: Planète , Planète tellurique , Vénus , Planète intérieure
Catégories : Système solaire

Licence : Domaine Public Domaine Public Icônes

Fichier ( image 94.31 kB)

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Le Bureau de l'astronomie pour l'éducation est hébergé par la Maison de l'astronomie sur le campus de l'Institut Max Planck d'astronomie à Heidelberg. Le Bureau de l'astronomie pour l'éducation est un bureau de l'Union Astronomique Internationale, avec un financement important des Fondations Klaus Tschira et Carl Zeiss. Les colloques Shaw-IAU sur l'astronomie pour l'éducation sont financés par la Fondation Shaw Prize.