IC 2574 :科丁頓星雲
IC 2574: Coddington's Nebula

來源:Dane Vetter|發表日期:2026-02-19
壯麗的螺旋星系常被視為宇宙的寵兒,它們在美麗對稱的螺旋臂中炫耀著年輕明亮的藍色星團。然而,小型不規則星系同樣孕育著恆星。事實上,矮星系IC 2574 中那些發紅的氫氣輝光區域,正是激烈恆星形成活動的明確證據。 與螺旋星系相似,IC 2574 中湍動的星形成區域同樣受到恆星風和超新星爆炸的攪動——這些天體噴射出的物質充盈星系的星際介質,進而觸發新一輪恆星誕生。 這座距地球僅 1200 萬光年的星系隸屬M 81 星系群,位於北天大熊座方向。這片被稱為"科丁頓星雲"的幽微島宇宙直徑約 5 萬光年,由美國天文學家埃德溫·科丁頓於 1898 年發現。
原文:Grand spiral galaxies often seem to get all the glory, flaunting their young, bright, blue star clusters in beautiful, symmetric spiral arms. But small, irregular galaxies form stars too. In fact, dwarf galaxy IC 2574 shows clear evidence of intense star forming activity in its telltale reddish regions of glowing hydrogen gas. Just as in spiral galaxies, the turbulent star-forming regions in IC 2574 are churned by stellar winds and supernova explosions spewing material into the galaxy's interstellar medium and triggering further star formation. A mere 12 million light-years distant, IC 2574 is part of the M81 group of galaxies, seen toward the northern constellation Ursa Major. Also known as Coddington's Nebula, the faint but intriguing island universe is about 50,000 light-years across, discovered by American astronomer Edwin Coddington in 1898.
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