一枪消灭仙女座菌株
(原标题: Andromeda in a Single Shot)
2021-06-25
浏览次数: 31
你能看多远？距地球250万光年远的仙女座星系是肉眼能轻易看到的最遥远的天体。夜空中的其他天体，如恒星、星团和星云，通常都有几百到几千光年的距离。这远远超出了太阳系，但在我们的银河系内。这个外部星系也被称为M31，在葡萄牙南部一个老矿井精心设计的深夜空中，它正位于烟囱上方。这张照片是在一次对天空的曝光中拍摄的，所以前景由于相机的运动而略微模糊，而仙女座菌株本身则显得很大。星系明亮的中心区域，通常都是肉眼可见的，可以看到它延伸到螺旋臂，而暗淡的外部区域横跨天空的四个满月。当然，只要50亿年左右的时间，仙女座星系的恒星就可以横跨整个夜空，因为仙女座星系与银河系合并了。
查看原文解释
How far can you see? The Andromeda Galaxy, 2.5 million light years away, is the most distant object easily seen by the unaided eye. Other denizens of the night sky, like stars, clusters, and nebulae, are typically hundreds to thousands of light-years distant. That's far beyond the Solar System but well within our own Milky Way Galaxy. Also known as M31, the external galaxy poses directly above a chimney in this well-planned deep night skyscape from an old mine in southern Portugal. The image was captured in a single exposure tracking the sky, so the foreground is slightly blurred by the camera's motion while Andromeda itself looms large. The galaxy's brighter central region, normally all that's visible to the naked-eye, can be seen extending to spiral arms with fainter outer reaches spanning over 4 full moons across the sky. Of course in only 5 billion years or so, the stars of Andromeda could span the entire night sky as the Andromeda Galaxy merges with the Milky Way.
© Miguel Claro