银河系之前的流星
(原标题: Meteor before Galaxy)
2022-08-07
浏览次数: 15
仙女座星系前面的那条绿色条纹是什么？一颗流星。2016年，在英仙座流星雨高峰附近拍摄仙女座星系时，一颗来自深空的小鹅卵石正好穿过我们银河系遥远的伙伴。这颗小流星只用了不到一秒的时间就穿过了这个10度的磁场。这颗流星在进入地球大气层时猛烈刹车，并多次闪光。这种绿色至少在一定程度上是由流星蒸发时的气体发光造成的。虽然拍摄的时间是为了捕捉英仙座流星，但拍摄到的条纹的方向似乎更符合南三角洲宝瓶座的流星，这是一场几周前达到顶峰的流星雨。并非巧合的是，英仙座流星雨将在本周晚些时候达到高峰，尽管今年的流星雨将不得不比近满月照亮的天空更亮。
查看原文解释
What's that green streak in front of the Andromeda galaxy? A meteor. While photographing the Andromeda galaxy in 2016, near the peak of the Perseid Meteor Shower, a small pebble from deep space crossed right in front of our Milky Way Galaxy's far-distant companion. The small meteor took only a fraction of a second to pass through this 10-degree field. The meteor flared several times while braking violently upon entering Earth's atmosphere. The green color was created, at least in part, by the meteor's gas glowing as it vaporized. Although the exposure was timed to catch a Perseid meteor, the orientation of the imaged streak seems a better match to a meteor from the Southern Delta Aquariids, a meteor shower that peaked a few weeks earlier. Not coincidentally, the Perseid Meteor Shower peaks later this week, although this year the meteors will have to outshine a sky brightened by a nearly full moon.
© Fritz Helmut Hemmerich