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新智彗星的蜕变，作者为斯洛伐克的 Tomáš Slovinský 和 Petr Horálek
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为 OAE 制作
图注： 2021年国际天文学联合会（IAU）OAE天文摄影比赛彗星类别第一名。
这幅照片使用了计时摄影技术，捕捉了 C/2020 F3（Neowise，译名“新智”）彗星随时间演变的过程，它于2020年7月出现在北半球的天空。彗星的轨道形状是极扁的椭圆，这意味着它们的一部分轨道会接近太阳。当彗星接近太阳时，它会受热并释放出气体和尘埃，围绕在彗核周围，称为彗发。太阳风和光子（构成电磁辐射的粒子）与彗发相互作用，产生彗尾，在这张图片中清晰可见。彗尾总是指向远离太阳的方向，绵延数千万公里。彗尾由两部分组成：相对笔直的蓝色气体（离子或等离子体）尾，由与太阳风磁场相互作用的带电粒子组成；白色尘埃尾，由非常小的尘埃颗粒组成，由于它们的速度较慢，因而被来自太阳的辐射压力推成曲线。太阳系中通常被认为是“彗星仓库”的两个区域是柯伊伯带和奥尔特云。周期短于二百年的彗星来自柯伊伯带，它是位于海王星以外的一个圆盘状的彗核物质库。周期长于二百年的彗星来自奥尔特云，它是另一个巨大的冰质天体库，呈球状环绕着太阳系。奥尔特云的外部界限目前还不清楚，但可能是日地距离的一万倍，甚至更远。由于引力扰动，其中一些彗核可能会被抛射到内太阳系，有时会接近地球，为人们展现最壮观的天象。图片还展示了一些著名的星座和星群，如北斗七星和小熊座，以及北极星。
来源： Tomáš Slovinský and Petr Horálek/IAU OAE
词汇表:
彗星
分类：
肉眼天文学
, 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
此文件在 Zenodo 上 ( 图像 19.53 MB)
Waxing Gibbous Moon
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图注： This image, taken from the Southern Hemisphere (New Zealand), shows the waxing gibbous Moon. During this lunar phase, we see most of the Moon's illuminated half with the unilluminated half only appearing as a dark crescent on the right. This phase comes after first quarter moon (sometimes called half moon) and before full moon.
来源： Dave Young / dcysurfer
来源链接
词汇表:
月相 , 盈凸月
分类：
太阳系
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
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619.97 kB)
Waning gibbous moon
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图注： This image, taken from the Southern Hemisphere (New Zealand), shows the waning gibbous Moon. During this lunar phase, we see most of the Moon's illuminated half with the unilluminated half only appearing as a dark crescent on the left. This phase comes after full moon and before last quarter moon (sometimes called half moon) .
来源： Dave Young / dcysurfer
来源链接
词汇表:
月相 , 亏凸月 , 凸月
分类：
太阳系
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
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574.96 kB)
OAE Node France & OAE Center India Staff
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图注： Emmanuel Rollinde from the OAE Node France at CY Cergy Paris Univerity is welcomed by the OAE Center India staff.
来源： OAENF-CY and OAE Center India
The Speed of Spacecraft
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图注： This infographic is part of the "Simplifying Astronomy for Arabic Speakers" project, aiming to present scientific concepts in a simple and accessible way. The design focuses on the speed of spacecraft during the various stages of their launch, illustrating how velocity changes as the spacecraft progresses to reach the desired orbit.
Details of the Stages:
Stage One (Launch):
The spacecraft begins its journey by launching from the launch pad with an increasing speed. The velocity in this stage is influenced by Earth's gravity and atmospheric resistance.
After One Minute:
The spacecraft reaches a speed of approximately 1,600 kilometers per hour (km/h), reflecting a rapid acceleration powered by its engines.
After Two and a Half Minutes:
The rocket boosters are jettisoned, allowing the spacecraft to reach a speed of about 4,800 km/h. At this point, the spacecraft becomes lighter, enabling it to accelerate more efficiently.
Final Stage:
By the end of the ascent phase, the spacecraft achieves its final speed of approximately 28,000 km/h, allowing it to enter the desired orbit around Earth.
Through educational designs like this, the project provides enthusiasts with an opportunity to understand the intricate details of space missions in an engaging and simplified manner.
来源： Ali Al-Edhari ; Background image credit - NASA
词汇表:
火箭
语言： Arabic
文字系统： Arabic
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
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11.88 MB)
