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マゼランの小さな雲 The Small Cloud of Magellan
⚠️ 特定の写真家による著作物
北半球の一般の観測者にはほとんど知られていないが、南の空にはマゼラン雲と呼ばれる2つの拡散した天体が存在する。マゼラン雲は、私たちの銀河系である天の川銀河の周りを公転する小さな不規則銀河である。ここに写っている小マゼラン雲(SMC)は約25万光年離れており、若い高温の青い星が多数存在することから、最近星形成が活発に行われたことがわかる。SMCは実際には2つの銀河が重なり合って1つの銀河のように見えるという証拠がある。画面右端付近の明るい塊は、天の川銀河の外縁部付近にある球状星団である。
原文(English)
Almost unknown to casual observers in the northern hemisphere, the southern sky contains two diffuse wonders known as the Magellanic Clouds. The Magellanic Clouds are small irregular galaxies orbiting our own larger Milky Way spiral galaxy. The Small Magellanic Cloud (SMC), pictured here, is about 250,000 light years away and contains a preponderance of young, hot, blue stars indicating it has undergone a recent period of star formation. There is evidence that the SMC is actually two galaxies superposed to appear as one. The bright blob near the right hand edge of the frame is a globular cluster near the outskirts of the Milky Way.

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© Anglo-Australian Telescope Board Explanation: Almost unknown to casual observers in the northern hemisphere, the southern sky contains two diffuse wonders known as the Magellanic Clouds. The Magellanic Clouds are small irregular galaxies orbiting our own larger Milky Way spiral galaxy. The Small Magellanic Cloud (SMC), pictured here, is about 250,000 light years away and contains a preponderance of young, hot, blue stars indicating it has undergone a recent period of star formation. There is evidence that the SMC is actually two galaxies superposed to appear as one. The bright blob near the right hand edge of the frame is a globular cluster near the outskirts of the Milky Way. Tomorrow's picture: GL 105C: The Coolest Star? | Archive | Glossary | Education | About APOD | Astronomy Picture of the Day (APOD) is created and edited in 1995 by Robert Nemiroff (GMU) and Jerry Bonnell (USRA). Specific rights may apply. Correspondence about APOD should be addressed to nemiroff@grossc.gsfc.nasa.gov or bonnell@grossc.gsfc.nasa.gov. A service of the Laboratory for High Energy Astrophysics (LHEA) at NASA/ GSFC Technical Rep: Sherri Calvo, 301-286-5668, sherri.calvo@gsfc.nasa.gov Questions/Comments/Feedback to: feedback@athena.gsfc.nasa.gov General astronomy pointers are available. / APOD