美国国家航空航天局NASA每日一图(天文)-2017年8月6日(银河系和爆炸流星 )

2017 August 6

Milky Way and Exploding Meteor
Image Credit & Copyright: André van der Hoeven
Explanation: Next weekend the Perseid Meteor Shower reaches its maximum. Grains of icy rock will streak across the sky as they evaporate during entry into Earth's atmosphere. These grains were shed from Comet Swift-Tuttle. The Perseids result from the annual crossing of the Earth through Comet Swift-Tuttle's orbit, and are typically the most active meteor shower of the year. Although it is hard to predict the level of activity in any meteor shower, in a clear dark sky an observer might see a meteor a minute. This year's Perseids peak nearly a week after full Moon, and so some faint meteors will be lost to the lunar skyglow. Meteor showers in general are best be seen from a relaxing position, away from lights. Featured here is a meteor caught exploding during the 2015 Perseids above Austria next to the central band of our Milky Way Galaxy.

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2017年8月6日

银河系和爆炸流星
图像信用与版权: Andrévan der Hoeven
说明: 下周末 Perseid流星雨达到最大值。冰冷的岩石 在进入地球大气层时会蒸发而 飞越天空。这些谷物从彗星Swift-Tuttle流下 。在英仙座流星雨从地球通过年度道口造成 斯威夫特-塔特尔彗星的轨道,并且通常是最活跃的 流星雨的一年。虽然很难预测任何流星雨中的活动水平 ,但在晴朗的黑暗中,观察者可能会看到一颗 流星。今年' 在“ 满月”之后的一个星期内,Perseids高峰 ,所以一些微弱的流星将失去了月球的天空。 一般来说, 流星雨最好从放松的位置看出,远离灯光。 这里特色的 是 ,在2015年在奥地利以外的 Perseids附近 ,我们的银河系中央带的 爆发。

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