从太空看星系
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大麦哲伦星系
2023年9月7日 The Large Cloud of Magellan Image Credit & Copyright: Chris Willocks Explanation: The 16th century Portuguese navigator Ferdinand Magellan and his crew had plenty of time to study the southern sky during the first circumnavigation of planet Earth. As a result, two fuzzy cloud-like objects easily visible to southern hemisphere skygazers are known as the Clouds of Magellan, now understood to be satellite galaxies of our much larger, spiral Milky Way galaxy. About 160,000 light-years distant in the constellation Dorado, the Large Magellanic Cloud is seen in this sharp galaxy portrait. Spanning about 15,000 light-years or so, it is the most massive of the Milky Way’s satellite galaxies and is the home of the closest supernova in modern times, SN 1987A. The prominent patch…
三个星系与一颗彗星
2023年8月27日 Three Galaxies and a Comet Credit & Copyright: Miloslav Druckmuller (Brno University of Technology) Explanation: Diffuse starlight and dark nebulae along the southern Milky Way arc over the horizon and sprawl diagonally through this gorgeous nightscape. The breath-taking mosaic spans a wide 100 degrees, with the rugged terrain of the Patagonia, Argentina region in the foreground. Along with the insider’s view of our own galaxy, the image features our outside perspective on two irregular satellite galaxies – the Large and Small Magellanic Clouds. The scene also captures the broad tail and bright coma of Comet McNaught, the Great Comet of 2007. Tomorrow’s picture: game stars 三个星系与一颗彗星 影像提供与版权: Miloslav Druckmuller (Brno University of Technology) 说明: 在这幅壮丽的影像里，沿着斜贯过夜空的南天银河分布之弥漫星光和暗星云，悬在地平线上方。这幅迷人拼接影像的张角宽达100度，前景则是位于阿根廷巴塔哥尼亚的崎岖原野。影像呈现我们身为银河系圈内人所见的光景之外，也记录了我们作为圈外人所看到的大和小麦哲伦星系，这二个形状不规则的银河伴星系之身影。此外，这张影像也捕捉到曳着宽广彗尾和明亮彗发的2007年大彗星──麦克诺彗星。 明日的图片: game stars
SuperBIT影像: 蜘蛛星云
2023年4月27日 The Tarantula Nebula from SuperBIT Image Credit: SuperBIT, NASA Explanation: The Tarantula Nebula, also known as 30 Doradus, is more than a thousand light-years in diameter, a giant star forming region within nearby satellite galaxy the Large Magellanic Cloud. About 160 thousand light-years away, it’s the largest, most violent star forming region known in the whole Local Group of galaxies. The cosmic arachnid is near the center of this spectacular image taken during the flight of SuperBIT (Super Pressure Balloon Imaging Telescope), NASA’s balloon-borne 0.5 meter telescope now floating near the edge of space. Within the well-studied Tarantula (NGC 2070), intense radiation, stellar winds and supernova shocks from the central young cluster of massive stars, cataloged as R136, energize the nebular glow and shape…
深场图像: 大麦哲伦星系
2023年3月7日 Deep Field: The Large Magellanic Cloud Image Credit & Copyright: Yuri Beletsky (Carnegie Las Campanas Observatory, TWAN) Explanation: Is this a spiral galaxy? No. Actually, it is the Large Magellanic Cloud (LMC), the largest satellite galaxy of our own Milky Way Galaxy. The LMC is classified as a dwarf irregular galaxy because of its normally chaotic appearance. In this deep and wide exposure, however, the full extent of the LMC becomes visible. Surprisingly, during longer exposures, the LMC begins to resemble a barred spiral galaxy. The Large Magellanic Cloud lies only about 180,000 light-years distant towards the constellation of the Dolphinfish (Dorado). Spanning about 15,000 light-years, the LMC was the site of SN1987A, the brightest and closest supernova in modern times. Together with the…
NGC 1850: 银河系找不到的天体
2023年2月20日 NGC 1850: Not Found in the Milky Way Image Credit: NASA, ESA and P. Goudfrooij (STScI); Processing: M. H. Özsaraç (Türkiye Astronomi Derneği) Explanation: There is nothing like this ball of stars in our Milky Way Galaxy. This is surprising because, at first glance, this featured image by the Hubble Space Telescope suggests that star cluster NGC 1850’s size and shape are reminiscent of the many ancient globular star clusters which roam our own Milky Way Galaxy’s halo. But NGC 1850’s stars are all too young, making it a type of star cluster with no known counterpart in the Milky Way. Moreover, NGC 1850 is also a double star cluster, with a second, compact cluster of stars visible here just to the right of…
智利上空的大与小麦哲伦星系
2023年2月11日 Magellanic Clouds over Chile Image Credit & Copyright: Felipe Mac Auliffe López Explanation: The two prominent clouds in this Chilean Atacama Desert skyscape captured on January 21 actually lie beyond our Milky Way galaxy. Known as the Large and the Small Magellanic Clouds they are so named for the 16th century Portuguese explorer Ferdinand Magellan, leader of the first circumnavigation of planet Earth. Famous jewels of southern hemisphere skies, they are the brightest satellite galaxies of the Milky Way. The larger cloud is some 160,000 light-years, and the smaller 210,000 light-years distant. While both are irregular dwarf galaxies in their own right, they exhibit central barred structures in the deep wide-angle view. Wide and deep exposures also reveal faint dusty galactic cirrus nebulae and…