堰蜓座的暗星云

堰蜓座的暗星云

ByNASA中文

2022年1月17日 Chamaeleon Dark Nebulas Image Credit & Copyright: Jarmo Ruuth, Telescope Live, Heaven’s Mirror Observatory Explanation: Sometimes the dark dust of interstellar space has an angular elegance. Such is the case toward the far-south constellation of Chamaeleon. Normally too faint to see, dark dust is best known for blocking visible light from stars and galaxies behind it. In this four-hour exposure, however, the dust is seen mostly in light of its own, with its strong red and near-infrared colors giving creating a brown hue. Contrastingly blue, the bright star Beta Chamaeleontis is visible just to the right of center, with the dust that surrounds it preferentially reflecting blue light from its primarily blue-white color. All of the pictured stars and dust occur in our own…

美丽的三叶星云

美丽的三叶星云

ByNASA中文

2021年8月12日 A Beautiful Trifid Image Credit & Copyright: Mike Selby Explanation: The beautiful Trifid Nebula is a cosmic study in contrasts. Also known as M20, it lies about 5,000 light-years away toward the nebula rich constellation Sagittarius. A star forming region in the plane of our galaxy, the Trifid does illustrate three different types of astronomical nebulae; red emission nebulae dominated by light from hydrogen atoms, blue reflection nebulae produced by dust reflecting starlight, and dark nebulae where dense dust clouds appear in silhouette. But the red emission region roughly separated into three parts by obscuring dust lanes is what lends the Trifid its popular name. Pillars and jets sculpted by newborn stars, below and left of the emission nebula’s center, appear in famous Hubble…

天蝎座的黑塔星云

天蝎座的黑塔星云

ByNASA中文

2021年7月15日 The Dark Tower in Scorpius Image Credit & Copyright: Data – Martin Pugh Processing – Rocco Sung Explanation: In silhouette against a crowded star field along the tail of the arachnalogical constellation Scorpius, this dusty cosmic cloud evokes for some the image of an ominous dark tower. In fact, clumps of dust and molecular gas collapsing to form stars may well lurk within the dark nebula, a structure that spans almost 40 light-years across this gorgeous telescopic portrait. Known as a cometary globule, the swept-back cloud, is shaped by intense ultraviolet radiation from the OB association of very hot stars in NGC 6231, off the upper edge of the scene. That energetic ultraviolet light also powers the globule’s bordering reddish glow of hydrogen gas….

LDN 1622:猎户座的暗星云

LDN 1622:猎户座的暗星云

ByNASA中文

2020 February 21 LDN 1622: Dark Nebula in Orion Image Credit & Copyright: Min Xie Explanation: The silhouette of an intriguing dark nebula inhabits this cosmic scene. Lynds’ Dark Nebula (LDN) 1622 appears against a faint background of glowing hydrogen gas only visible in long telescopic exposures of the region. In contrast, the brighter reflection nebula vdB 62 is more easily seen, just above and right of center. LDN 1622 lies near the plane of our Milky Way Galaxy, close on the sky to Barnard’s Loop, a large cloud surrounding the rich complex of emission nebulae found in the Belt and Sword of Orion. With swept-back outlines, the obscuring dust of LDN 1622 is thought to lie at a similar distance, perhaps 1,500 light-years away….

麒麟座的星云

麒麟座的星云

ByNASA中文

2020 February 8 Cosmic Clouds in the Unicorn Image Credit & Copyright: Bray Falls Explanation: Interstellar clouds of hydrogen gas and dust abound in this gorgeous skyscape. The 3 degree wide field of view stretches through the faint but fanciful constellation Monoceros, the Unicorn. A star forming region cataloged as NGC 2264 is centered, a complex jumble of cosmic gas, dust and stars about 2,700 light-years distant. It mixes reddish emission nebulae excited by energetic light from newborn stars with dark dust clouds. Where the otherwise obscuring dust clouds lie close to hot, young stars they also reflect starlight, forming blue reflection nebulae. A few light-years across, a simple sculpted shape known as the Cone Nebula is near center. Outlined by the red glow of…

在沃夫洞穴里

在沃夫洞穴里

ByNASA中文

2019 September 7 In Wolf’s Cave Image Credit & Copyright: Charlie Bracken, Mladen Dugec, Max Whitby Explanation: The mysterious blue reflection nebula found in catalogs as VdB 152 or Ced 201 really is very faint. It lies at the tip of the long dark nebula Barnard 175 in a dusty complex that has also been called Wolf’s Cave. At the center of this deep and widefield telescopic view, the cosmic apparitions are nearly 1,400 light-years away along the northern Milky Way in the royal constellation Cepheus. Near the edge of a large molecular cloud, pockets of interstellar dust in the region block light from background stars or scatter light from the embedded bright star giving the the nebula its characteristic blue color. Ultraviolet light from…

蝘蜓座II暗星云

蝘蜓座II暗星云

ByNASA中文

Chamaeleon II Dark Cloud Image Credit & Copyright: Don Goldman Explanation: A small constellation hiding near the south celestial pole, The Chamaeleon boasts no bright stars. Stars are forming within its constellation boundaries though, in a complex of dark, dusty molecular clouds. Some 500 light-years distant, the Chamaeleon II dark nebula inhabits this view where the cosmic dust clouds standout mostly in silhouette against the starry southern sky. The telescopic frame is about the angular size of a Full Moon and so spans about 5 light-years at the dark cloud’s estimated distance. Scattered near center a telltale reddish glow from identified Herbig-Haro objects is seen in the sharp image, jets of shocked glowing gas emanating from recently formed stars. 蝘蜓座II暗星云 影像提供与版权: Don Goldman 说明: 蝘蜓座是南天极附近，一个里头没有亮星的小星座。不过，这个星座里的黝黑尘埃分子云复合体，仍不停的在形成恒星。在这幅影像里，距离约500光年远的蝘蜓座II暗分子云，之所以会以剪影之姿现踪，是因为有南天的繁星为衬托。这幅张角与满月相当的望远镜影像，依这团暗星云的估计距离来换算，大约涵盖了5光年的区域。在这幅清晰影像中心附近，带着特征泛红辉光的物体，是因刚诞生恒星发出的喷流，冲撞激震周围的云气发光而形成的赫比格-哈罗天体。