流星与银河系擦肩而过
(原标题: Meteor Misses Galaxy)
2024-07-14
浏览次数: 17
银河系从未处于危险之中。首先，图中所示的三角座星系（M33）比流星头部的微小岩石颗粒要大得多。另一方面，银河系离我们远得多——在这个例子中是300万光年，而不是只有0.0003光秒。即便如此，这颗流星的轨迹还是以一定的角度落在了银河系的下方。此外，地球大气层高处的风将流星发光的蒸发分子链吹离星系，形成角状投影。尽管如此，这位天体摄影师还是很幸运地在一次曝光中同时捕捉到了一颗流星和一个星系——随后，这张照片被添加到M33的另外两张照片中，以显示螺旋星系的颜色。最后，流星在一秒钟内就消失了，但这个星系将持续数十亿年。你的天空惊喜：APOD在你的生日上展示了什么照片？(1995后)
查看原文解释
The galaxy was never in danger. For one thing, the Triangulum galaxy (M33), pictured, is much bigger than the tiny grain of rock at the head of the meteor. For another, the galaxy is much farther away -- in this instance 3 million light years as opposed to only about 0.0003 light seconds. Even so, the meteor's path took it angularly below the galaxy. Also the wind high in Earth's atmosphere blew the meteor's glowing evaporative molecule train away from the galaxy, in angular projection. Still, the astrophotographer was quite lucky to capture both a meteor and a galaxy in a single exposure -- which was subsequently added to two other images of M33 to bring up the spiral galaxy's colors. At the end, the meteor was gone in a second, but the galaxy will last billions of years. Your Sky Surprise: What picture did APOD feature on your birthday? (post 1995)
© Aman Chokshi