File:A pulsating stellar relic.jpg

原始檔案 (1,280 × 1,305 像素,檔案大小:275 KB,MIME 類型:image/jpeg


摘要

描述
English: This NASA/ESA Hubble Space Telescope image shows the planetary nebula NGC 2452, located in the southern constellation of Puppis. The blue haze across the frame is what remains of a star like our Sun after it has depleted all its fuel. When this happens, the core of the star becomes unstable and releases huge numbers of incredibly energetic particles that blow the star's atmosphere away into space.

At the centre of this blue cloud lies what remains of the nebula's progenitor star. This cool, dim, and extremely dense star is actually a pulsating white dwarf, meaning that its brightness varies over time as gravity causes waves that pulse throughout the small star's body.

NGC 2452 was discovered by Sir John Herschel in 1847. He initially defined it as "an object whose nature I cannot make out. It is certainly not a star, nor a close double star [...] I should call it an oblong planetary nebula". To early observers like Herschel with their smaller telescopes, planetary nebulae resembled gaseous planets, and so were named accordingly. The name has stuck, although modern telescopes like Hubble have made it clear that these objects are not planets at all, but the outer layers of dying stars being thrown off into space.

A version of this image was entered into the Hubble's Hidden Treasures image processing competition by contestants Luca Limatola and Budeanu Cosmin Mirel.
日期
來源 http://www.spacetelescope.org/images/potw1339a/
作者 ESA/Hubble & NASA

授權條款

w:zh:創用CC
姓名標示
姓名標示
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:zh:創用CC
姓名標示
此檔案採用創用CC 姓名標示 4.0 國際授權條款。
姓名標示: ESA/Hubble
您可以自由:
  • 分享 – 複製、發佈和傳播本作品
  • 重新修改 – 創作演繹作品
惟需遵照下列條件:
  • 姓名標示 – 您必須指名出正確的製作者,和提供授權條款的連結,以及表示是否有對內容上做出變更。您可以用任何合理的方式來行動,但不得以任何方式表明授權條款是對您許可或是由您所使用。

說明

添加單行說明來描述出檔案所代表的內容

在此檔案描寫的項目

描繪內容

image/jpeg

68f41a07f2b9e97fff6dd3355ef9d5bf8fcceecb

斷定方法:​SHA-1 中文 (已轉換拼寫)

281,918 位元組

1,305 像素

1,280 像素

檔案歷史

點選日期/時間以檢視該時間的檔案版本。

日期/時間縮⁠圖尺寸使用者備⁠註
目前2013年10月2日 (三) 00:43於 2013年10月2日 (三) 00:43 版本的縮圖1,280 × 1,305(275 KB)JmencisomUser created page with UploadWizard

下列頁面有用到此檔案:

全域檔案使用狀況

以下其他 wiki 使用了這個檔案:

  • el.wikipedia.org 的使用狀況
  • en.wikipedia.org 的使用狀況
  • es.wikipedia.org 的使用狀況
  • la.wikipedia.org 的使用狀況
  • mk.wikipedia.org 的使用狀況
  • nl.wikipedia.org 的使用狀況
  • pl.wikipedia.org 的使用狀況
  • sk.wikipedia.org 的使用狀況
  • sv.wikipedia.org 的使用狀況
  • vi.wikipedia.org 的使用狀況

詮釋資料