明亮的流星，星空
(原标题: Bright Meteor, Starry Sky)
2021-08-19
浏览次数: 59
这颗明亮的英仙座流星以每秒60公里的速度穿过地球大气层，在星光灿烂的银河系中划过。8月12日摄于葡萄牙黑暗的天空，画面从右向左移动。它的彩色轨迹从天津四（天鹅座α星）附近开始，在牛郎星（金牛座α星）附近结束，牛郎星是夏季北部三角的恒星。事实上，这颗英仙座流星非常短暂地超过了地球夜晚最亮的两颗恒星。这条轨迹最初的绿光是英仙座流星雨的典型特征。从周期性的斯威夫特-塔特尔彗星上刮来的宇宙沙粒移动得足够快，足以在100公里左右的高度激发原子氧的典型绿色辐射，然后在白炽闪光中蒸发。著名的APOD图片提交：英仙座流星雨2021
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Plowing through Earth's atmosphere at 60 kilometers per second, this bright perseid meteor streaks along a starry Milky Way. Captured in dark Portugal skies on August 12, it moves right to left through the frame. Its colorful trail starts near Deneb (alpha Cygni) and ends near Altair (alpha Aquilae), stars of the northern summer triangle. In fact this perseid meteor very briefly outshines both, two of the brightest stars in planet Earth's night. The trail's initial greenish glow is typical of the bright perseid shower meteors. The grains of cosmic sand, swept up dust from periodic comet Swift-Tuttle, are moving fast enough to excite the characteristic green emission of atomic oxygen at altitudes of 100 kilometers or so before vaporizing in an incandescent flash. Notable APOD Image Submissions: Perseid Meteor Shower 2021
© Miguel Claro