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A pulsating stellar relic.jpg |
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. |
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來源 | http://www.spacetelescope.org/images/potw1339a/ |
作者 | ESA/Hubble & NASA |
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共享創意署名4.0國際 Chinese (Hong Kong) (已轉換拼寫)
30 9 2013
多媒體型式 繁體中文 (已轉換拼寫)
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資料大小 Chinese (Hong Kong) (已轉換拼寫)
281,918 位元組
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目前 | 2013年10月2日 (三) 00:43 | 1,280 × 1,305(275 KB) | Jmencisom | User created page with UploadWizard |
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影像標題 |
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來源 | ESA/Hubble |
製作/提供者 | ESA/Hubble & NASAAcknowledgements: Luca Limatola, Budeanu Cosmin Mirel |
簡稱 |
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使用條款 |
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資料產生的日期時間 | 2013年9月30日 (一) 10:00 |
關鍵字 | NGC 2452 |
聯絡資訊 |
http://www.spacetelescope.org/ Karl-Schwarzschild-Strasse 2 Garching bei München, , D-85748 Germany |