文档与资源 - 搜索结果
搜索结果
Balloon Flask Workshop: modelling the celestial sphere
图像
图注： Participants look on a demonstration of how to model the celestial sphere
来源： Organisers of the 4th Chilean Astronomy Education Conference
扬帆天海
图像
为 OAE 制作
图注： 在这张于2022年4月用智能手机拍摄的黑白照片，一叶孤舟停靠在澳大利亚尤坎本湖畔，被银河系的璀璨星空所衬托。银心的耀眼光芒在夜空中格外醒目，其星云与恒星交织的复杂图案形成了鲜明的对比。每一颗闪耀的光点都是一颗遥远的恒星，或许周围还环绕着未被探索的行星，突显了我们广袤而复杂的银河家园的浩瀚。
来源： 胡韵希/国际天文学联合会教育办公室 (CC BY 4.0)
词汇表:
银河系 , 导航
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 7.11 MB)
Atmosphere of Venus
图像
图注： This image of Venus was captured in ultraviolet light by the Pioneer Venus Orbiter and highlights features of the planet’s thick atmosphere that are not visible in ordinary light. Venus has a dense, cloudy atmosphere composed mainly of carbon dioxide. In ultraviolet wavelengths, patterns in the upper cloud layers become visible, revealing swirling structures and bright and dark bands caused by differences in the composition and motion of the atmosphere. These ultraviolet features help scientists map wind patterns, atmospheric circulation, and cloud dynamics high above Venus’s surface.
Unlike Earth’s atmosphere, which is relatively transparent in visible light, Venus’s atmosphere is so thick that no direct view of the surface is possible from space without special instruments. The extreme pressure and temperature near Venus’s surface are consequences of this dense gaseous envelope, making Venus a dramatic example of how different planetary atmospheres can be. This image demonstrates how observing a planet’s atmosphere in different wavelengths, such as ultraviolet, reveals details about its structure and behaviour.
来源： NASA
来源链接
词汇表:
大气层 , 金星
授权许可： 公共领域 公共领域 图标
文件
( 图像
8.09 MB)
Moon and Earth's thin atmosphere
图像
图注： Taken from the International Space Station (ISS), approximately 400 kilometers above the ground, the picture shows the Moon far in the background and Earth's thin atmosphere. It appears blue as light in this wavelength is scattered more than in others by the gases in the upper layers. The photo was taken in March 2015 by a crew member. Clearly visible is the vanishingly small layer of gases compared to Earth's dimensions. There is no clear border between the atmosphere and space; it is a smooth transition with no sharp edges. The thickness to the upper limit of the stratosphere, roughly 50 kilometers, does not even amount to one percent of Earth's radius. Above 600 kilometers, particles reaching the critical escape velocity can leave into space. The total mass of the atmosphere is around 300 times less than that of all oceans combined or one million times less than Earth's total mass.
来源： Earth Science and Remote Sensing Unit, NASA Johnson Space Center
来源链接
词汇表:
大气层
分类：
地球
授权许可： 公共领域 公共领域 图标
文件
( 图像
3.99 MB)
H-alpha image of the Sun's chromosphere
图像
图注： This false-color image was captured with a 10-cm telescope at the Big Bear Solar Observatory (BBSO) in the United States in July 2002. It depicts the full disk of the Sun using the H-alpha emission line of hydrogen. When observed in this spectral line, the Sun's chromosphere appears particularly prominent due to hydrogen atoms emitting light at the specific wavelength. This emission produces a distinctive red color, making features such as spicules (jets of plasma that look hair-like) and plage (bright patches in the chromosphere) highly visible. Several small solar prominences can be seen protruding from the edge of the solar disk. When prominences (also known as filaments) cross the face of the disk they appear as dark threads caused by the cooler material in the prominence absorbing light. The chromosphere is also visible in the violet part of the solar spectrum due to ionized calcium showing emissions in these wavelengths.
来源： Big Bear Solar Observatory (BBSO)/New Jersey Institut of Technology (NJIT)
来源链接
词汇表:
色球 , 日珥 , 太阳 , 光谱线
分类：
太阳
授权许可： 公共领域 公共领域 图标
文件
( 图像
2.82 MB)
