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A neutron star appears as a blue spot surrounded by shells of material which appear as red and green rings

Death of a massive star

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Légende : A multi-wavelength image taken with telescopes on the Earth and in space of a neutron star within our neighbouring Small Magellanic Cloud galaxy. A neutron star (seen here as the blue spot surrounded by a red ring) is the final product of gravitational collapse, compression and explosion of a massive star, left embedded in its supernova remnant (in green).
Crédit : ESO/NASA, ESA and the Hubble Heritage Team (STScI/AURA)/F. Vogt et al.
Lien du crédit

Termes du glossaire: Étoile à neutrons , Vestiges stellaires , Supernova
Catégories : 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

Fichier ( image 758.18 kB)


An all-sky image. Above a ring of stones shaped like door-frames, the bright curved paths of star trails seem to form circles

Stone Star Circles, Startrails above Stonehenge, by Till Credner, Germany

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Créé pour l'OAE

Légende : Second place in the IAU OAE Astrophotography Contest, category Star trails. Astronomy is one of the oldest (if not the oldest) of the sciences, and as such has connection to various cultures over millennia. This image in a way conveys this relationship by being contextualised in Stonehenge. There is much research into what astronomers call archeoastronomy sites, and how they connect to the sky (for example, seasons, phases of the moon and much more). Civilizations across time and from all over the world have their own views and interpretations of what they see in the sky, and this has been tied not only to culture but also to the people’s day-to-day and seasonal activities. The “concentric circles” which are often referred to as “star trails”, are the result of the apparent motion of the sky, which is in reality due to the rotation of the Earth on its axis. The small dot appearing towards the top center of the image is Polaris – The North or Pole Star. Polaris is only visible to observers in the Northern latitudes. The height of the Pole Star can be used to infer the observer’s actual latitude. Stonehenge is located at around 51° North. This image is taken from one of the most notable ancient sites in the world, brings us back in time, and makes us wonder about the stories told by the people that lived in that place many millennia ago.
Crédit : Till Credner/IAU OAE

Termes du glossaire: Étoiles circumpolaires , La piste des étoiles
Catégories : 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 1.26 MB)


Small arcs of stars streak across the sky forming a circular pattern. Two dashed straight lines appear on the right.

Star Trails

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Créé pour l'OAE

Légende : Honorable mention in the 2023 IAU OAE Astrophotography Contest, category of Still images taken exclusively with smartphones/mobile devices. Taken in the darkness of Panotiya, Amartiya village, India, this image from October 2022 showcases beautiful star trails painting the night sky. With only a smartphone and a tripod, the photographer captured these trails — visual evidence of our planet's rotation, as each streak represents the apparent movement of the stars as the Earth spins, creating a captivating cosmic choreography of light. The distinct colours of the stars — some gleaming blue, others whitish — hint at their varying temperatures and compositions. Additionally, a subtle streak of an aeroplane momentarily intersects the timeless dance of the stars, juxtaposing the serene heavens with the bustling activity of life below.
Crédit : Govind Gurjar/IAU OAE (CC BY 4.0)

Termes du glossaire: Sphère Céleste , La rotation de la Terre
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 ( image 1.98 MB)


A traditional Chinese building. Above the streaks of stars form a circular pattern around the north star.

Star Trails of the Forbidden City

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Créé pour l'OAE

Légende : Honorable mention in the 2023 IAU OAE Astrophotography Contest, category of Still images taken exclusively with smartphones/mobile devices. Beneath the celestial ballet of star trails that weave their way across the night sky, the Beijing Forbidden City stands as a testament to ancient celestial connections in this image captured in March 2022. Designed with a cosmic alignment in mind, the palace echoes the orientation of the North Star, also known as Polaris, a celestial anchor that has long guided navigators and symbolised steadiness in the sky. It was believed that the Emperor embodied the earthly representation of this pole star, bridging the realms between heaven and earth. In this harmonious one-hour exposure captured with a smartphone, the streaks of stars trace their nightly journey across the firmament, converging toward the North Star, reflecting the precision of both architectural design and celestial paths.
Crédit : Stephanie Ziyi Ye/IAU OAE (CC BY 4.0)

Termes du glossaire: Pôle céleste , Sphère Céleste , Étoiles circumpolaires , Navigation , Pôle céleste nord (PCN) , Polaris
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 ( image 4.12 MB)


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)


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