File:Little gem.jpg

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描述Little gem.jpg	English: This colourful bubble is a planetary nebula called NGC 6818, also known as the Little Gem Nebula. It is located in the constellation of Sagittarius (The Archer), roughly 6000 light-years away from us. The rich glow of the cloud is just over half a light-year across — humongous compared to its tiny central star — but still a little gem on a cosmic scale. When stars like the Sun enter retirement, they shed their outer layers into space to create glowing clouds of gas called planetary nebulae. This ejection of mass is uneven, and planetary nebulae can have very complex shapes. NGC 6818 shows knotty filament-like structures and distinct layers of material, with a bright and enclosed central bubble surrounded by a larger, more diffuse cloud. Scientists believe that the stellar wind from the central star propels the outflowing material, sculpting the elongated shape of NGC 6818. As this fast wind smashes through the slower-moving cloud it creates particularly bright blowouts at the bubble’s outer layers. Hubble previously imaged this nebula back in 1997 with its Wide Field Planetary Camera 2, using a mix of filters that highlighted emission from ionised oxygen and hydrogen (opo9811h). This image, while from the same camera, uses different filters to reveal a different view of the nebula. A version of the image was submitted to the Hubble’s Hidden Treasures image processing competition by contestant Judy Schmidt.
日期	2015年8月3日, 10:00:00
來源	http://www.spacetelescope.org/images/potw1531a/
作者	ESA/Hubble & NASA Acknowledgement: Judy Schmidt (geckzilla.com)

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NGC 6818

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製作/提供者	ESA/Hubble & NASA Acknowledgement: Judy Schmidt (geckzilla.com)
來源	ESA/Hubble
簡稱	Little gem
影像標題	This colourful bubble is a planetary nebula called NGC 6818, also known as the Little Gem Nebula. It is located in the constellation of Sagittarius (The Archer), roughly 6000 light-years away from us. The rich glow of the cloud is just over half a light-year across — humongous compared to its tiny central star — but still a little gem on a cosmic scale. When stars like the Sun enter retirement, they shed their outer layers into space to create glowing clouds of gas called planetary nebulae. This ejection of mass is uneven, and planetary nebulae can have very complex shapes. NGC 6818 shows knotty filament-like structures and distinct layers of material, with a bright and enclosed central bubble surrounded by a larger, more diffuse cloud. Scientists believe that the stellar wind from the central star propels the outflowing material, sculpting the elongated shape of NGC 6818. As this fast wind smashes through the slower-moving cloud it creates particularly bright blowouts at the bubble’s outer layers. Hubble previously imaged this nebula back in 1997 with its Wide Field Planetary Camera 2, using a mix of filters that highlighted emission from ionised oxygen and hydrogen (opo9811h). This image, while from the same camera, uses different filters to reveal a different view of the nebula. A version of the image was submitted to the Hubble’s Hidden Treasures image processing competition by contestant Judy Schmidt.
使用條款	Creative Commons Attribution 3.0 Unported license
資料產生的日期時間	2015年8月3日 (一) 10:00
使用軟體	Adobe Photoshop CC 2014 (Windows)
原始文件唯一識別碼	xmp.did:02c24bab-f4f5-5544-9cdf-f7ce06627b22
關鍵字	Little Gem Nebula NGC 6818
聯絡資訊	http://www.spacetelescope.org/ Karl-Schwarzschild-Strasse 2 Garching bei M√ºnchen, , D-85748 Germany
IIM 版本	4

File:Little gem.jpg

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共享創意署名4.0國際 ^{Chinese (Hong Kong) (已轉換拼寫)}

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File:Little gem.jpg

摘要

授權條款

說明

在此檔案描寫的項目

描繪內容

著作權狀態 繁體中文 (已轉換拼寫)

有著作權 繁體中文 (已轉換拼寫)

特許條款

共享創意署名4.0國際 Chinese (Hong Kong) (已轉換拼寫)

成立或建立時間

3 8 2015

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著作權狀態 ^{繁體中文 (已轉換拼寫)}

有著作權 ^{繁體中文 (已轉換拼寫)}

共享創意署名4.0國際 ^{Chinese (Hong Kong) (已轉換拼寫)}