Wikipédia

Fichier:Neptune’s shrinking vortex.jpg

Fichier d’origine ‎(1 200 × 572 pixels, taille du fichier : 93 kio, type MIME : image/jpeg)

Ce fichier et sa description proviennent de Wikimedia Commons.

Accéder au fichier sur Commons

Description

Description
English: Neptune, the eighth and farthest planet from the Sun, was visited for the first and last time by NASA’s Voyager 2 mission in 1989. Since then, the NASA/ESA Hubble Space Telescope has been attempting to unearth the myriad mysteries surrounding this cool, majestic behemoth — including deciphering why it has the fastest wind speeds of any planet in the Solar System, and what lies at its centre.

These new Hubble images reveal one of the standout features of Neptune’s strange atmosphere: a rare dark spot, or dark vortex — a whirling high-pressure atmospheric system usually accompanied by bright “companion clouds”. This particular dark spot is named SDS-2015 (Southern Dark Spot discovered in 2015), and is only the fifth observed so far on Neptune. Although it appears to be slightly smaller than previous dark spots, observations of SDS-2015 from 2015 to 2017 revealed that the spot was once big enough to almost swallow China before rapidly diminishing in size.

Each of the five dark spots found on Neptune have been curiously diverse, but all have appeared and disappeared within just a few years — as opposed to similar vortices on Jupiter which evolve over decades. Bright clouds form alongside dark spots when the flow of ambient air is disturbed and diverted upwards over the spot, likely causing gases to freeze into methane ice crystals.

Only Hubble is currently powerful enough to image Neptune’s dark spots, and produce striking images such as these; these views were taken over the course of two years using Hubble’s Wide Field Camera 3 (WFC3).
한국어: 1989년 NASA 보이저 2호가 태양에서 여덟 번째이자 가장 먼 행성인 해왕성을 처음이자 마지막으로 방문했다. 그 이후로 NASA/ESA 허블 우주 망원경은 이 멋지고 장엄한 거대 물체를 둘러싼 무수한 미스터리를 파헤치기 위해 노력해 왔습니다. 여기에는 태양계 행성 중 풍속이 가장 빠른 이유와 그 중심에 무엇이 있는지도 포함되어 있습니다. 이 새로운 허블 이미지는 해왕성의 기이한 대기의 두드러진 특징 중 하나를 보여줍니다: 드문 어두운 점 또는 어두운 소용돌이 - 일반적으로 밝은 "동반자 구름"이 동반되는 소용돌이 치는 고압 대기 시스템.이 특정 흑점은 SDS-2015(2015년에 발견된 남부 흑점)로 명명되었으며 지금까지 해왕성에서 다섯 번째로 관찰되었습니다. 이전의 흑점보다 약간 작은 것처럼 보이지만 2015년부터 2017년까지 SDS-2015를 관찰한 결과 그 반점은 한때 중국을 거의 삼킬 정도로 컸던 것으로 나타났습니다.
Date
Source http://www.spacetelescope.org/images/potw1808a/
Auteur NASA, ESA, and M.H. Wong and A.I. Hsu (UC Berkeley)

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

Historique du fichier

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

Date et heureVignetteDimensionsUtilisateurCommentaire
actuel19 février 2018 à 14:48Vignette pour la version du 19 février 2018 à 14:481 200 × 572 (93 kio)JmencisomUser created page with UploadWizard

Les 2 pages suivantes utilisent ce fichier :

Usage global du fichier

Les autres wikis suivants utilisent ce fichier :

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:Neptune’s_shrinking_vortex.jpg ».