M27：哑铃星云
(原标题: M27: The Dumbbell Nebula)
2024-12-30
浏览次数: 22
我们的太阳会变成这样吗？很有可能。关于太阳未来的第一个线索是在1764年偶然发现的。当时，查尔斯·梅西耶（Charles Messier）正在编制一份漫射天体的清单，以免与彗星混淆。梅西耶名单上的第27个天体，现在被称为M27或哑铃星云，是一个行星状星云，是天空中最亮的行星状星云之一，用双筒望远镜可以看到狐狸星座（Vulpecula）。从M27发出的光大约需要1000年才能到达我们这里，这里的颜色是由硫（红色）、氢（绿色）和氧（蓝色）发出的。我们现在知道，在大约60亿年后，我们的太阳将把它的外层气体释放成一个像M27这样的行星状星云，而它的剩余中心将变成一颗x射线热白矮星。然而，对M27的物理学和意义的理解远远超出了18世纪的科学范畴。即使在今天，关于行星状星云的许多事情仍然是神秘的，包括它们复杂的形状是如何形成的。APOD年度回顾：2024年夜空网络演示
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Is this what will become of our Sun? Quite possibly. The first hint of our Sun's future was discovered inadvertently in 1764. At that time, Charles Messier was compiling a list of diffuse objects not to be confused with comets. The 27th object on Messier's list, now known as M27 or the Dumbbell Nebula, is a planetary nebula, one of the brightest planetary nebulas on the sky and visible with binoculars toward the constellation of the Fox (Vulpecula). It takes light about 1000 years to reach us from M27, featured here in colors emitted by sulfur (red), hydrogen (green) and oxygen (blue). We now know that in about 6 billion years, our Sun will shed its outer gases into a planetary nebula like M27, while its remaining center will become an X-ray hot white dwarf star. Understanding the physics and significance of M27 was well beyond 18th century science, though. Even today, many things remain mysterious about planetary nebulas, including how their intricate shapes are created. APOD Year in Review: Night Sky Network Presentation for 2024
© Christopher Stobie