中国念湖上空的双子座流星雨

中国念湖上空的双子座流星雨

ByNASA中文

2023年12月17日 Geminids over China’s Nianhu Lake Image Credit & Copyright: Hongyang Luo Explanation: Where are all of these meteors coming from? In terms of direction on the sky, the pointed answer is the constellation of Gemini. That is why the major meteor shower in December is known as the Geminids — because shower meteors all appear to come from a radiant toward Gemini. Three dimensionally, however, sand-sized debris expelled from the unusual asteroid 3200 Phaethon follows a well-defined orbit about our Sun, and the part of the orbit that approaches Earth is superposed in front of the constellation of Gemini. Therefore, when Earth crosses this orbit, the radiant point of falling debris appears in Gemini. Featured here is a composite of many images taken a…

中国上空的虹彩幞状云

中国上空的虹彩幞状云

ByNASA中文

2022年9月6日 An Iridescent Pileus Cloud over China Image Credit & Copyright: Jiaqi Sun （孙嘉琪） Explanation: Yes, but how many dark clouds have a multicolored lining? Pictured, behind this darker cloud, is a pileus iridescent cloud, a group of water droplets that have a uniformly similar size and so together diffract different colors of sunlight by different amounts. The featured image was taken last month in Pu’er, Yunnan Province, China. Also captured were unusual cloud ripples above the pileus cloud. The formation of a rare pileus cloud capping a common cumulus cloud is an indication that the lower cloud is expanding upward and might well develop into a storm. Explore Your Universe: Random APOD Generator Tomorrow’s picture: tarantula’s webb 中国上空的虹彩幞状云 影像提供与版权: Jiaqi Sun（孙嘉琪） 说明: 多少乌云拥有色彩缤纷的衬套呢？如影像所示，这朵暗云的上头罩着一团虹彩幞状云，而其原始真身为一大团大小均一的小水滴，协同把不同颜色的阳光，不等量的衍射到不同的方向。这张在上个月摄于中国云南省普洱市的主题影像，还记录了幞状云上头的不寻常波纹。寻常的积雨云上方罩着罕见的幞状云，显示低层云正在向上扩张，或许会发展成风暴。 探索你的宇宙:…

雪峰上空的甘姆星云

雪峰上空的甘姆星云

ByNASA中文

2022年6月27日 The Gum Nebula over Snowy Mountains Image Credit & Copyright: Wang Jin Explanation: The Gum Nebula is so large and close it is actually hard to see. This interstellar expanse of glowing hydrogen gas frequently evades notice because it spans 35 degrees — over 70 full Moons — while much of it is quite dim. This featured spectacular 90-degree wide mosaic, however, was designed to be both wide and deep enough to bring up the Gum — visible in red on the right. The image was acquired late last year with both the foreground — including Haba Snow Mountain — and the background — including the Milky Way’s central band — captured by the same camera and from the same location in Shangri-La, Yunnan,…

英仙座流星与银河

英仙座流星与银河

ByNASA中文

2021年8月3日 A Perseid Fireball and the Milky Way Image Credit & Copyright: Dandan Huang Explanation: It was bright and green and flashed as it moved quickly along the Milky Way. It left a trail that took 30 minutes to dissipate. Given the day, August 12, and the direction, away from Perseus, it was likely a small bit from the nucleus of Comet Swift-Tuttle plowing through the Earth’s atmosphere — and therefore part of the annual Perseids meteor shower. The astrophotographer captured the fireball as it shot across the sky in 2018 above a valley in Yichang, Hubei, China. The meteor’s streak, also caught on video, ended near the direction of Mars on the lower left. Next week, the 2021 Perseids meteor shower will peak again….

祝融号：新火星车

祝融号：新火星车

ByNASA中文

2021年06月15日 Zhurong: New Rover on Mars Image Credit: China National Space Administration Explanation: There’s a new rover on Mars. In mid-May, China’s Tianwen-1 mission delivered the Zhurong rover onto the red planet. As Mars means Planet of Fire in Chinese, the Zhurong rover’s name means, roughly, God of Fire in Chinese mythology. Zhurong landed in northern Utopia Planitia, the largest known impact basin in the Solar System, and an area reported to have much underground ice. Among many other scientific instruments, Zhurong carries ground-penetrating radar that can detect ice buried even 100-meters deep. Car-sized Zhurong is pictured here next to its landing base. The image was snapped by a remote camera deployed by the rolling rover. Zhurong’s planned 90-day mission includes studying the geology, soil,…

返回器的迹线

返回器的迹线

ByNASA中文

2020年12月31日 Trail of the Returner Image Credit & Copyright: Zhuoxiao Wang Explanation: Familiar stars of a northern winter’s night shine in this night skyview, taken near Zhangye, Gansu, China and the border with Inner Mongolia. During the early hours of December 17 Orion is near center in the single exposure that captures a fireball streaking across the sky, almost as bright as yellowish Mars shining on the right. Splitting Gemini’s twin bright stars Castor and Pollux near the top of the frame, the fireball’s trail and timing are consistent with the second skipping atmospheric entry of the Chang’e 5 mission’s returner capsule. The returner capsule was successfully recovered after landing in Inner Mongolia, planet Earth with about 2 kilograms of lunar material on board. The…

风暴洋的吕姆克山

风暴洋的吕姆克山

ByNASA中文

2020年12月05日 Mons Rumker in the Ocean of Storms Image Credit & Copyright: Jean-Yves Letellier Explanation: Mons Rumker, a 70 kilometer wide complex of volcanic domes, rises some 1100 meters above the vast, smooth lunar mare known as Oceanus Procellarum, the Ocean of Storms. Daylight came to the area late last month. The lunar terminator, the shadow line between night and day, runs diagonally across the left side in this telescopic close-up of a waxing gibbous Moon from November 27. China’s Chang’e-5 mission landing site is also in the frame. The probe’s lander-ascender combination touch down on the lunar surface within a region right of center and north of Mons Rumker’s domes on December 1. On December 3 the ascender left the Ocean of Storms carrying…