红色和蓝色的昴宿星
(原标题: The Pleiades in Red and Blue)
2025-07-08
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如果你仰望天空，看到一群满月大小的恒星，那就是昴宿星团（M45）。也许是天空中最著名的星团，即使在光污染的城市也能看到它最亮的恒星。但是你的肉眼也可以在黑暗的天空下看到它的星云——它周围的气体和尘埃。然而，望远镜可以捕捉到更多。昴宿星团中明亮的蓝色恒星，也被称为七姐妹星团，照亮了周围的尘埃，使其呈现出弥漫的蓝色，只有在长时间曝光下才能看到。但这还不是全部。宇宙尘埃看起来像空灵的手臂一样向上伸展。整个结构被宇宙中最丰富的元素——氢——发出的红色光芒所包围。这张特色图像由近25小时的曝光组成，去年在美国德克萨斯州的星前天文台拍摄，探索你的宇宙：随机APOD发生器
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If you have looked at the sky and seen a group of stars about the size of the full Moon, that's the Pleiades (M45). Perhaps the most famous star cluster in the sky, its brightest stars can be seen even from the light-polluted cities. But your unaided eye can also see its nebulosity -- the gas and dust surrounding it -- under dark skies. However, telescopes can catch even more. The bright blue stars of the Pleiades, also known as the Seven Sisters, light up their surrounding dust, causing it to appear a diffuse blue that can only be seen under long exposures. But that's not all. The cosmic dust appears to stretch upward like ethereal arms. And the entire structure is surrounded by a reddish glow from the most abundant element in the universe: hydrogen. The featured image is composed of nearly 25 hours of exposure and was captured last year from Starfront Observatory, in Texas, USA Explore Your Universe: Random APOD Generator
© Ogetay Kayali (Michigan Tech U.) Text: Ogetay Kayali (Michigan Tech U.)