Glossary term: 不規則星系
Description: 不規則星系是一種對稱性很低或不對稱的星系（其具有扭曲的形態或形狀）。它們通常比螺旋星系和橢圓星系小，通常含有大量的恆星形成氣體。大麥哲倫星雲和小麥哲倫星雲是不規則星系，距離我們的銀河系相對較近（分別約為 16 萬光年和 20 萬光年），可以在地球南半球用肉眼觀測到。
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See this term in other languages
Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher The translation of this term and its definition is still awaiting approval
This is an automated transliteration of the simplified Chinese translation of this term
The OAE Multilingual Glossary is a project of the IAU Office of Astronomy for Education (OAE) in collaboration with the IAU Office of Astronomy Outreach (OAO). The terms and definitions were chosen, written and reviewed by a collective effort from the OAE, the OAE Centers and Nodes, the OAE National Astronomy Education Coordinators (NAECs) and other volunteers. You can find a full list of credits here. All glossary terms and their definitions are released under a Creative Commons CC BY-4.0 license and should be credited to "IAU OAE".
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In Other Languages
- 阿拉伯語: المجرة غير المنتظمة
- 孟加拉語: নৈমিত্তিক ছায়াপথ
- 德語: Irreguläre Galaxie
- 英語: Irregular Galaxy
- 法語: Galaxie irrégulière
- 義大利語: Galassia irregolare
- 日語: 不規則銀河 (external link)
- 巴西葡萄牙語: Galáxia Irregular
- 簡體中文: 不规则星系
Related Media
NGC 5264 - An irregular island
Caption: The dwarf irregular galaxy NGC 5264 is located 15 million light years away. It is only about 11,000 light years across, much smaller than our Milky Way, and consists of approximately a billion stars. It lacks the spiral structure of our home Galaxy. The small blue patches in NGC 5264 mark groups of young hot blue stars. This suggests that stars formation in this galaxy is still on-going.
Credit: ESA/Hubble and NASA
credit link
License: CC-BY-4.0 Creative Commons 姓名標示 4.0 國際 (CC BY 4.0) icons
Related Diagrams
雕刻座星圖
Caption: 雕刻座及其明亮恆星與周邊星座示意圖。從頂部開始沿順時針方向，雕刻座周邊的星座依次為：鯨魚座、水瓶座、南魚座、天鶴座、鳳凰座和天爐座。
雕刻座是一個南天星座，因此在南半球的任何地區，一年中的某個時段都可以完整看到整個星座。在赤道地區以及北半球的大部分溫帶地區，也能看到整個雕刻座。而在北半球剩餘的溫帶地區，亦可見到該星座的部分區域。在北半球，雕刻座最適合於深秋的夜晚觀測，在南半球，則以晚春的夜晚為最佳觀測時機。
不規則星系NGC 55，以及螺旋星系NGC 253和NGC 300，均位於雕刻座內。它們在此處以紅色橢圓標示。
該圖的縱軸為赤緯，橫軸為赤經，方向為上北下南左東右西。圖中標注的恆星大小對應其視星等——衡量天體視亮度的標準，較大的圓點代表著較亮的恆星。圖中的希臘字母標注著星座中最亮的恆星。這些恆星按亮度排序，最亮的一般被標記為α星，第二亮的一般為β星，等等，不過這種字母排序並不總是和實際亮度排序完全一致。圖中虛線標注的是國際天文學聯合會劃定的星座邊界，綠色實線則是一種常見的星座形象連線。需要注意的是，在實際觀測時，這些邊界與連線都不會出現在天空中。
Credit: 國際天文學聯合會天文教育辦公室（IAU OAE）根據國際天文學聯合會和《天空與望遠鏡》的原文改編
License: CC-BY-4.0 Creative Commons 姓名標示 4.0 國際 (CC BY 4.0) icons
