2025年7月8日
The Pleiades in Red and Blue
Image Credit & Copyright: Ogetay Kayali (Michigan Tech U.) Text: Ogetay Kayali (Michigan Tech U.)
Explanation: 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
Tomorrow’s picture: open space
红与蓝色的昴宿星团
影像提供与版权: Ogetay Kayali (Michigan Tech U.) 文稿: Ogetay Kayali (Michigan Tech U.)
说明: 如果你曾仰望夜空，看到一群大小和满月相近的恒星，那会是昴宿星团（M45）。昴宿星团或许是地球天空中最著名的星团，即使在有光害的城市，仍然能看见到它最明亮的数颗成员星。而在黝黑无光害的夜空中，人类的肉眼甚至可以看到环拱在昴宿星团周围的气体与尘埃云气。在昴宿星团里，明亮泛蓝有七姐妹之称的成员星，照亮了周遭的尘埃，造就了在长曝光影像里的弥漫蓝色光晕。不仅如此，这些宇宙尘埃看来酷似垂直上举的空灵手臂。而整个结构，则像是镶在宇宙最丰富元素氢散发的泛红辉光里。这幅总曝光时间将近25小时的主题影像，是由位在美国 德州的Starfront天文台摄于去年。
探索你的宇宙: 随机APOD生成器
明日的图片: open space
