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The planet PDS 70b inside a protoplanetary disk
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图注： An image of the planet PDS 70b. The young star PDS 70b has a protoplanetary disk surrounding it. Disks like these contains gas, fine sandy particles that astronomers refer to as dust and also larger bodies ranging from objects the size of pebbles to protoplanets (planets that are still forming).
This image was taken in infrared light using adaptive optics. Adaptive optics is a technique that uses flexible mirrors and computer analysis to remove the blurring effect of the Earth's atmosphere. This allows astronomers to search regions close to stars like PDS 70 that would otherwise be swamped by light from the star spread out by the Earth's atmosphere. In the center is a black circle. This is caused by a coronograph, a small circle that blocks out light from the parent star. This is surrounded by a bright oval, infrared light emitted from the material in the protoplanetary disk. To the right of the black circle covering the star is a bright dot. This is PDS 70b, a giant planet that is still forming .
来源： ESO/ A. Müller, MPIA
来源链接
词汇表:
行星形成 , 原行星 , 原行星盘 , 自适应光学
分类：
系外行星与天体生物学
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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1.59 MB)
Venus Transit from Tempe, AZ, USA , June 5, 2012
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图注： While the planet Venus regularly passes between the Sun and the Earth, most of the time it passes above or below the Sun when observed from Earth. On rare occasions, the planet Venus passes directly in front of the Sun for observers on Earth. The last such Venus transits were in 2004 and 2012, respectively. The next such transit will be in 2117. The picture was taken at 18:54 PDT on June 5, 2012, from Tempe, Arizona, US. The telescope used was an 8" Schmidt-Cassegrain with ND5 filter; the camera was a Sony NEX5N with the APS sensor placed at prime focus. Clearly visible are the disk of the Sun, Venus as a prominent round spot. Several sun spots also appear on the solar disk.
来源： Stephen Rector
来源链接
词汇表:
凌 , 金星
分类：
太阳系
授权许可： 知识共享许可协议 Attribution-ShareAlike 3.0 Unported 知识共享许可协议 Attribution-ShareAlike 3.0 Unported 图标
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4.60 MB)
Baghdad Planetarium Using Telescopes and Planetarium Software poster
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图注： Promotional poster for the astronomy training workshop titled “Using Telescopes and Planetarium Software,” held on August 3–4, 2025, at the Baghdad Planetarium. Organized by the Scientific Welfare Department – Ministry of Youth and Sports in cooperation with the IAU OAE National Astronomy Education Coordinator team for Iraq.
来源： NAEC team Iraq
Group photo of the participants at the Beijing Planetarium
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图注： Teacher Training Participants at the Beijing Planetarium
来源： OAE Center China, Nanjing
恒星长蛇座TW周围行星的形成
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图注： 这幅图像显示的是年轻恒星长蛇座TW周围的物质盘。这颗恒星足够年轻，的年龄只有大约一千万年，因此其周围的气体和尘埃盘中仍在形成行星。这幅图像是利用亚毫米望远镜阵列制作的，其中每台望远镜看起来都像一个碟形天线。这些望远镜接收到的信号由一台中央处理计算机合成，从而生成了这幅图像。其明暗程度表示的是物质盘上尘埃的多少。图中的暗环和亮环表明物质盘中的尘埃被带入了某些轨道，并远离了其他轨道。这可能是因为物质盘中隐藏着一颗或多颗仍处在形成过程中的行星。
整幅图像显示的环绕长蛇座TW的物质盘延伸到了距离中心恒星约70个天文单位处。外侧的两个暗环与中心恒星的距离大致相当于太阳与天王星之间的平均距离以及太阳与冥王星之间的平均距离。内侧中央的洞似乎是由一颗环绕长蛇座TW运行的行星雕刻出的，其与中心恒星的距离大致相当于地球与太阳之间的距离。
来源： S. Andrews (Harvard-Smithsonian CfA); B. Saxton (NRAO/AUI/NSF); ALMA (ESO/NAOJ/NRAO)
来源链接
词汇表:
行星形成
分类：
系外行星与天体生物学
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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210.48 kB)
