2025年8月20日
Perseid Meteors from Durdle Door
Image Credit & Copyright: Josh Dury
Explanation: What are those curved arcs in the sky? Meteors — specifically, meteors from this year’s Perseid meteor shower. Over the past few weeks, after the sky darkened, many images of Perseid meteors were captured separately and merged into a single frame, taken earlier. Although the meteors all traveled on straight paths, these paths appear slightly curved by the wide-angle lens of the capturing camera. The meteor streaks can all be traced back to a single point on the sky called the radiant, here just off the top of the frame in the constellation of Perseus. The same camera took a deep image of the background sky that brought up the central band of our Milky Way galaxy running nearly vertically through the featured image‘s center. The limestone arch in the foreground in Dorset, England is known as Durdle Door, a name thought to survive from a thousand years ago.
Tomorrow’s picture: open space
杜德尔门与英仙座流星
影像提供与版权: Josh Dury
说明: 天空中那些弯曲的光弧是什么？流星；更精确的说，是来自今年的英仙座流星雨的流星。在过去几星期入晚之后，记录了许多英仙座流星的照片，后来并与先前拍摄的背景照片叠合成这幅影像。虽然流星都沿直线前行，但由于是透过配备广角镜头的相机取像，导至流星迹看起来略微弯曲。这些流星的流星迹，则全都可回溯到天空中、紧贴在画面顶缘外头英仙座内的辐射点。于同一部相机所拍摄的长曝光背景天空影像里，可清楚见到我们银河系的中央盘面，几乎垂直穿过这幅主题影像的中心。影像前景里的石灰岩拱门，则是位于英格兰 多塞特郡的杜德尔门（Durdle Door），而此名称已存续流传了一千年。
明日的图片: open space
