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当太阳反弹时
图像
为 OAE 制作
图注: 这张照片拍摄于挪威的北角。由于该地的纬度原因,从四月到八月的夏季,太阳从未真正落下。这就形成了独特的连续白昼现象,即所谓的极昼。这组迷人的照片拍摄于 2022 年,展示了太阳每 30 分钟穿越地平线的不懈旅程。当太阳位于天空的最低点时,它不会落下,而是看起来像是从地平线反弹回来的。照片最右边的地球就像一个哨兵,标志着欧洲大陆的最北端。
来源: Milos Obert/IAU OAE (CC BY 4.0)
词汇表:
太阳路径(日弧) , 极圈 , 北极圈 , 极昼
分类:
肉眼天文学
标签:
astrophotography
授权许可: 知识共享许可协议 署名 4.0 国际 (CC BY 4.0) 知识共享许可协议 署名 4.0 国际 (CC BY 4.0) 图标
此文件在 Zenodo 上 ( 图像 3.54 MB)
黄石公园的北斗七星,作者Alex Conu,挪威
图像
为 OAE 制作
图注: 2021 年国际天文学联合会 OAE 天体摄影比赛广域星野类第一名。
这张照片拍摄的是北半球最突出、最著名的星群之一--北斗七星(Big Dipper)或犁星(Plough)。该星宿是希腊神话中大熊座的一部分。
北斗七星由七(八)颗恒星组成,从图像的中心向右延伸。形成斗勺“杯部”的四颗星呈梯形,就在图像右侧最高的树的上方。这四颗星分别是右上方的天枢(Dubhe)、右下方的天璇(Merak)、左上方的天玑(Megrez)和左下方的天权(Phecda)。形成斗柄的三(或四)颗星位于梯形的左侧,依次是从右到左的玉衡(Alioth)、开阳(Mizar)和摇光(Alkaid)。仔细观察开阳,可以看到它左上方紧邻着一颗较小的星星。这颗星就是开阳增一(Alcor),开阳和辅星共同构成裸眼可见的双星系统。然而,通过非常精确的观测发现,开阳实际上是一个四星系统,而辅星是一个双星系统。尽管这些恒星的名字源自阿拉伯语命名体系,但不同的文化都有自己的恒星名称。
在世界各地的不同文化中,这个星宿与不同的物体相关联,此外,一些土著文化还将单独的星星与特定的故事联系起来。星座除了承载着不同文化的传说和神话外,还是重要的导航 "工具"。例如,天枢(Dubhe)和天璇(Merak)两颗星可以用来找到北极星(Polaris)(本图中未显示)。鉴于北斗七星与北半球的关系,以及它是一个拱极星座(从不落在地平线以下),阿拉斯加州旗上使用了北斗七星和北极星。
值得注意的是,虽然星座中的恒星(除了开阳和开阳增一的多恒星系统外)看起来彼此 "相邻",但实际上这些恒星与地球和彼此间的距离是非常不同的。
来源: Alex Conu/IAU OAE
词汇表:
星宿(星群)
分类:
肉眼天文学
, 恒星
授权许可: 知识共享许可协议 署名 4.0 国际 (CC BY 4.0) 知识共享许可协议 署名 4.0 国际 (CC BY 4.0) 图标
此文件在 Zenodo 上 ( 图像 11.24 MB)
2024 Total Solar Eclipse from Space
视频
图注: The NASA Deep Space Climate Observatory (DSCOVR) captured the total solar eclipse over North America on the 8th of April, 2024 from space using its Earth Polychromatic Imaging Camera (EPIC). This video shows images of Earth taken over the course of four and a half hours. The Moon’s shadow on the Earth can be seen as it moves from south-west to north east. While the shadow looks like it covers a huge part of the continent, only a strip up to 185 km wide in the middle of the eclipse's path saw a total eclipse at some point on this day and at any one time only the central part of the shadow would have experienced a total solar eclipse. Most of the area covered by this shadow only saw a partial eclipse.
DSCOVR sits at L1, a stable gravitational point between the Sun and Earth and observes the day side of the Earth.
来源: NASA/DSCOVR EPIC team/Michala Garrison and Wanmei Liang
来源链接
词汇表:
日食
分类:
地球
, 太阳系
授权许可: 公共领域 公共领域 图标
文件
( 视频
2.86 MB)
The Pillars of Creation in comparison
图像
图注: The 'Pillars of Creation' are a renowned astronomical feature situated within the Eagle Nebula in the Serpens constellation. The illustration provides a direct comparison between images captured by the Hubble Space Telescope (HST) and the James Webb Space Telescope (JWST), showcasing the pillars, which span several light years in diameter, in both visible light (also known as optical light) and infrared light. On the left are the pillars as seen by Hubble in visual light, taken in 2014. It displays dark pillars against an opaque background, with only a handful of visible stars. Conversely, the counterpart on the right is Webb’s near-infrared view published in 2022, penetrating the dust and revealing numerous stars of varying sizes.
Their distance from Earth is approximately 6,500 to 7,000 light years. Within these pillars, new stars are constantly forming, making them a subject of extensive study by astronomers. Composed mostly of cool molecular hydrogen and small amounts of interstellar dust, they are subject to erosion by the intense ultraviolet radiation emitted by nearby massive and newborn stars, a process known as photoevaporation.
来源: NASA, ESA, CSA, STScI
来源链接
词汇表:
红外天文学 , 红外望远镜 , 光学天文学 , 恒星形成 , 可见光谱 , 尘埃云
分类:
银河系与星际介质
, 恒星
授权许可: 知识共享许可协议 Attribution 2.0 Generic 知识共享许可协议 Attribution 2.0 Generic 图标
文件
( 图像
12.03 MB)
A total solar eclipse over the La Silla Observatory, Chile
视频
图注: A real-time video showing the total solar eclipse on the 2nd of July 2019 over the La Silla Observatory in Chile. This video covers the moments before totality, the just under two minutes of totality, and the moments after totality. Note that at the start of the video the Sun was already almost completely obscured by the Moon, it is just hard to see due to the brightness of the Sun and the exposure of the camera. Indeed the Moon started partially eclipsing the Sun roughly an hour before the start of this recording and would continue to partially obscure the Sun for roughly the same time afterwards.
At the point of totality one can see the faint glow of the Sun’s diffuse outer regions and on the horizon one can also see the glow from the parts of the surrounding areas on Earth that are not experiencing totality.
来源: ESO/A. Santerne
来源链接
词汇表:
日食 , 日全食
分类:
地球
, 太阳系
授权许可: 知识共享许可协议 署名 4.0 国际 (CC BY 4.0) 知识共享许可协议 署名 4.0 国际 (CC BY 4.0) 图标
文件
( 视频
255.13 MB)
