用撒丁岛射电望远镜 SRT 观测北斗七星

视频
为 OAE 制作

图注： 这段延时摄影捕捉了来自国家天体物理研究所 (INAF) 的 64 米撒丁岛射电望远镜 (SRT) 周围的恒星运动，特别是在天球背景下著名的北斗七星。随着飞机飞过和射电望远镜旋转，著名的北斗七星在天空中下沉，镜头也随之移动。恒星的轨迹与射电望远镜的巨大天线之间的和谐互动，为 2019 年 9 月拍摄的宇宙芭蕾谱写了一曲令人着迷的视觉颂歌。
来源： Antonio Finazzi/IAU OAE (CC BY 4.0)

词汇表: 天文学 , 北斗七星 , 天极 , 天球 , 地球自转 , 观测 , 北极星
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 ( 视频 441.31 MB)

The Hale Telescope

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图注： This image shows the Hale Telescope at the Palomar Observatory in northern San Diego County, California, USA and operated by the California Institute of Technology (Caltech). With its 5.1 m primary mirror, the Hale Telescope was the largest effective optical telescope in the world from its first light in 1949 until 1993. Here we see the Hale Telescope when not in operation. The telescope itself is the large, vertical, approximately cylindrical object in the centre of the image. Telescopes like this use mirrors to gather faint light and form clear images of distant targets, enabling scientists to study everything from nearby stars and planets to remote galaxies. The primary mirror, seen here at the bottom of the telescope, focusses light from the sky to the prime focus at the top of the telescope. Instruments such as cameras and spectrographs can be placed at this prime focus or alternatively a secondary mirror can reflect light back down the telescope and through a hole in the primary mirror to instruments. The telescope is supported by a large mount, seen here at an angle to the telescope. This particular mount is a type of equatorial mount. This means that one of the rotation axes of the mount points to the celestial poles. When a star or galaxy moves across the sky due to the Earth's rotation, the telescope only has rotate on this axis to keep pointing at that star or galaxy. Most modern large telescopes use a different kind of mount and rely on computer calculations to accurately track an object across the sky. The Hale Telescope is housed under a large rotating dome that opens at night so the telescope can track objects across the sky.
来源： JPL/Caltech/Palomar Observatory
来源链接

词汇表: 反射式望远镜 , 望远镜
分类： 观测天文学 , 望远镜、仪器与天文台

授权许可： 公共领域 公共领域 图标

文件 ( 图像 12.65 MB)

Gemini South's primary mirror and telescope structure

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图注： This is the primary mirror and supporting structure of a large optical telescope at the Gemini South Observatory in Chile. The primary mirror is the largest and most important mirror in a reflecting telescope: its gently curved surface gathers light from faint stars, galaxies, and nebulae and reflects that light to a focal point. At this focal point light is either fed directly in to an instrument to record spectra and images or redirected to such an instrument by a series of further mirrors. The sturdy metal framework around the primary mirros keeps the mirror precisely aligned and protected while the telescope moves to track objects across the sky. In telescopes that use mirrors instead of lenses, such as this one, the mirror is what collects and focuses the light from distant celestial objects. Larger mirrors can capture more light, allowing astronomers to see fainter and more distant objects. A larger primary mirror can also take sharper images of the sky, but this is often negated by the blurring effect of the Earth's atmopshere. A primary mirror must be perfectly smooth to tolerances of fractions of a wavelength of light so that it produces sharp, clear images. We can think of the primary mirror as the “eye” of the telescope that looks out into space, with its shape and support enabling powerful astronomical observations.
来源： International Gemini Observatory/NOIRLab/NSF/AURA/M. Paredes
来源链接

词汇表: 反射式望远镜 , 反射镜
分类： 观测天文学 , 望远镜、仪器与天文台

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 ( 图像 23.24 MB)

How do telescopes work?

astroEDU 教育活动（链接至 astroEDU 网站）
描述: Let's discover telescopes and experiment simple optics

词汇表: 光学 , 望远镜
分类： 物理学 , 望远镜、仪器与天文台
年龄段： 10-12
受教育等级: Primary
学习领域： 引导式发现学习 , 以历史为主的活动 , 以观察为主
费用: 中等成本
时间跨度: 1 小时
组别大小： 小组
技能： 提出问题
作者： Alassiry Muhammed，Turkieh Jbour，Tareq Alkhateb

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

The Fibre Optic Cable Class

astroEDU 教育活动（链接至 astroEDU 网站）
描述: Learn about the amazing technology of fibre optics that has done so much for technology here on Earth and in observing space.

词汇表: 光谱学
分类： 望远镜、仪器与天文台
标签： Hands-on , Model , Sloan Digital Sky Survey , Software , fibre optics
年龄段： 10-12 , 12-14
受教育等级: 初中
学习领域： 建模 , 项目式学习 , 以模拟为主 , 结构化探究式学习
费用: 中等成本
时间跨度: 1 小时
组别大小： 小组
技能： 提出问题 , 规划并开展调查
作者： Amee Hennig

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