Wikipédia

Fichier:A home for old stars.jpg

Fichier d’origine ‎(1 280 × 1 091 pixels, taille du fichier : 553 kio, type MIME : image/jpeg)

Ce fichier et sa description proviennent de Wikimedia Commons.

Accéder au fichier sur Commons

Description

Description
English: This image, taken with the Wide Field Planetary Camera 2 on board the NASA/ESA Hubble Space Telescope, shows the globular cluster Terzan 1. Lying around 20 000 light-years from us in the constellation of Scorpius (The Scorpion), it is one of about 150 globular clusters belonging to our galaxy, the Milky Way.

Typical globular clusters are collections of around a hundred thousand stars, held together by their mutual gravitational attraction in a spherical shape a few hundred light-years across. It is thought that every galaxy has a population of globular clusters. Some, like the Milky Way, have a few hundred, while giant elliptical galaxies can have several thousand.

They contain some of the oldest stars in a galaxy, hence the reddish colours of the stars in this image — the bright blue ones are foreground stars, not part of the cluster. The ages of the stars in the globular cluster tell us that they were formed during the early stages of galaxy formation! Studying them can also help us to understand how galaxies formed.

Terzan 1, like many globular clusters, is a source of X-rays. It is likely that these X-rays come from binary star systems that contain a dense neutron star and a normal star. The neutron star drags material from the companion star, causing a burst of X-ray emission. The system then enters a quiescent phase in which the neutron star cools, giving off X-ray emission with different characteristics, before enough material from the companion builds up to trigger another outburst.
Date
Source http://www.spacetelescope.org/images/potw1550a/
Auteur NASA & ESA, Acknowledgement: Judy Schmidt (Geckzilla)

Conditions d’utilisation

w:fr:Creative Commons
paternité
paternité
 ESA/Hubble images, videos and web texts are released by the ESA under the Creative Commons Attribution 4.0 International license and may on a non-exclusive basis be reproduced without fee provided they are clearly and visibly credited. Detailed conditions are below; see the ESA copyright statement for full information. For images created by NASA or on the hubblesite.org website, or for ESA/Hubble images on the esahubble.org site before 2009, use the {{PD-Hubble}} tag.
Conditions:
  • The full image or footage credit must be presented in a clear and readable manner to all users, with the wording unaltered (for example: "ESA/Hubble"). Web texts should be credited to ESA/Hubble (except when used by media). The credit should not be hidden or disassociated from the image footage. Links should be active if the credit is online. See the usage rights Q&A section on the ESA copyright page for guidance.
  • ESA/Hubble materials may not be used to state or imply the endorsement by ESA/Hubble or any ESA/Hubble employee of a commercial product or service.
  • ESA/Hubble requests a copy of the product sent to them to be indexed in their archive.
  • If an image shows an identifiable person, using that image for commercial purposes may infringe that person's right of privacy, and separate permission should be obtained from the individual.
  • If images or visuals are changed significantly from the original work (apart from resizing, cropping), we suggest that the changes are mentioned after the credit line. For example "Original image by ESA/Hubble (M. Kornmesser), warping and recolouring by NN".

Notes:

  • Note that this general permission does not extend to the use of ESA/Hubble's logo, which shall remain protected and may not be used or reproduced without prior and individual written consent of ESA/Hubble.
  • Also note that music, scientific papers and code on the esahubble.org site are not released under this license and can not be used for non-ESA/Hubble products.
  • By reproducing ESA/Hubble material, in part or in full, the user acknowledges the terms on which such use is permitted.
w:fr:Creative Commons
paternité
Ce fichier est disponible selon les termes de la licence Creative Commons Attribution 4.0 International.
Attribution: ESA/Hubble
Vous êtes libre :
  • de partager – de copier, distribuer et transmettre cette œuvre
  • d’adapter – de modifier cette œuvre
Sous les conditions suivantes :
  • paternité – Vous devez donner les informations appropriées concernant l'auteur, fournir un lien vers la licence et indiquer si des modifications ont été faites. Vous pouvez faire cela par tout moyen raisonnable, mais en aucune façon suggérant que l’auteur vous soutient ou approuve l’utilisation que vous en faites.

Légendes

Ajoutez en une ligne la description de ce que représente ce fichier

Éléments décrits dans ce fichier

dépeint

type MIME

image/jpeg

somme de contrôle

49ad6de133dcc28bf88a670dd487ee8ff1708faf

méthode de détermination : SHA-1

taille des données

566 772 octet

hauteur

1 091 pixel

largeur

1 280 pixel

Historique du fichier

Cliquer sur une date et heure pour voir le fichier tel qu'il était à ce moment-là.

Date et heureVignetteDimensionsUtilisateurCommentaire
actuel15 décembre 2015 à 10:50Vignette pour la version du 15 décembre 2015 à 10:501 280 × 1 091 (553 kio)JmencisomUser created page with UploadWizard

La page suivante utilise ce fichier :

Usage global du fichier

Les autres wikis suivants utilisent ce fichier :

  • Utilisation sur en.wikipedia.org
  • Utilisation sur pl.wikipedia.org

Métadonnées

Ce fichier contient des informations supplémentaires, probablement ajoutées par l'appareil photo numérique ou le numériseur utilisé pour le créer.

Si le fichier a été modifié depuis son état original, certains détails peuvent ne pas refléter entièrement l'image modifiée.

Ce document provient de « https://fr.wikipedia.org/wiki/Fichier:A_home_for_old_stars.jpg ».