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APOD30周年(2025年6月16日)
マゼランの小さな雲
The Small Cloud of Magellan
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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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?
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