2020 February 16

NGC 2392: Double-Shelled Planetary Nebula
Image Credit:
NASA, ESA, Hubble, Chandra; Processing & License: Judy Schmidt

Explanation: To some, this huge nebula resembles a person’s head surrounded by a parka hood. In 1787, astronomer William Herschel discovered this unusual planetary nebula: NGC 2392. More recently, the Hubble Space Telescope imaged the nebula in visible light, while the nebula was also imaged in X-rays by the Chandra X-ray Observatory. The featured combined visible-X ray image, shows X-rays emitted by central hot gas in pink. The nebula displays gas clouds so complex they are not fully understood. NGC 2392 is a double-shelled planetary nebula, with the more distant gas having composed the outer layers of a Sun-like star only 10,000 years ago. The outer shell contains unusual light-year long orange filaments. The inner filaments visible are being ejected by strong wind of particles from the central star. The NGC 2392 Nebula spans about 1/3 of a light year and lies in our Milky Way Galaxy, about 3,000 light years distant, toward the constellation of the Twins (Gemini).

Tomorrow’s picture: fade to red

NGC 2392:双层的行星星云
NASA , ESA , Hubble , Chandra ;影像处理与授权: Judy Schmidt
说明: 有人认为这个庞大的星,形似戴着帕可连颈帽的人头。这个编录号为NGC 2392的不寻常行星状星云,是由天文学家威廉.赫歇尔发现于1787年。在最近,哈伯太空望远镜在可见光波段为这个星云拍照,在此同时,钱德拉X射线天文卫星,也在X射线波段为它造影。上面这幅整合了可见光和X射线数据的主题影像,以粉红色泽呈现中心炽热气体发出的X射线辐射。这个星云里的气体云形状极为复杂,其成因目前仍未完全厘清。NGC 2392是个双层的行星状星云,它较外围的结构,是一颗类太阳近在10,000年前抛出的外层气壳。这个外围结构拥有一些不寻常,长度将近光年的橙色条状结构。而内围的条状结构,则是中心星抛射的强烈恒星风粒子。位在我们银河系里的NGC 2392,宽约1/3光年,座落在双子座方向约3,000光年远之处。

明日的图片: fade to red

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Chris Martin.


颖奇 薛


毅 刘