NGC 7027：枕头状行星状星云
(原标题: NGC 7027: The Pillow Planetary Nebula)
2025-08-31
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是什么创造了这个不寻常的行星状星云？NGC 7027被称为枕头星云和飞毯星云，是已知最小、最亮、形状最不寻常的行星状星云之一。考虑到它的膨胀速度，NGC 7027第一次开始膨胀，就像在地球上看到的那样，大约是在600年前。在它的大部分历史中，行星状星云一直在驱逐壳，正如哈勃太空望远镜拍摄的蓝色特色图像所示。然而，在现代，由于未知的原因，它开始向特定的方向喷射气体和尘埃（见棕色部分），形成了一个似乎有四个角的新图案。星云中心是什么是未知的，有一种假设认为它是一个紧密的双星系统，其中一颗恒星将气体释放到围绕另一颗恒星运行的不稳定的圆盘上。NGC 7027距离地球约3000光年，于1878年首次被发现，可以用标准的后院望远镜看到天鹅（天鹅座）。
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What created this unusual planetary nebula? Dubbed the Pillow Nebula and the Flying Carpet Nebula, NGC 7027 is one of the smallest, brightest, and most unusually shaped planetary nebulas known. Given its expansion rate, NGC 7027 first started expanding, as visible from Earth, about 600 years ago. For much of its history, the planetary nebula has been expelling shells, as seen in blue in the featured image by the Hubble Space Telescope. In modern times, though, for reasons unknown, it began ejecting gas and dust (seen in brown) in specific directions that created a new pattern that seems to have four corners. What lies at the nebula's center is unknown, with one hypothesis holding it to be a close binary star system where one star sheds gas onto an erratic disk orbiting the other star. NGC 7027, about 3,000 light years away, was first discovered in 1878 and can be seen with a standard backyard telescope toward the constellation of the Swan (Cygnus).