Astronomy Picture of the Day—飞机穿越蛾眉月

Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.

2019 February 28

PlaneCrossing a Crescent Moon

ImageCredit & Copyright: Olivier Staiger (Binounistan.com)

Explanation:No, this is not a good way to get to the Moon. What is pictured is a chancesuperposition of an airplane and the Moon. The contrail would normally appearwhite, but the large volume of air toward the setting Sun preferentially knocksaway blue light, giving the reflected trail a bright red hue. Far in thedistance, well behind the plane, is a crescent Moon, also slightly reddened.Captured a month ago above Valais, Switzerland, the featured image was taken sosoon after sunset that planes in the sky were still in sunlight, as were theircontrails. Within minutes, unfortunately, the impromptu sky show ended. Theplane crossed the Moon and moved out of sight. The Moon set. The contrailbecame unilluminated and then dispersed.

飞机穿越蛾眉月

解释：不，这可不是前往月球的好办法。此图是飞机和月球的偶然重合。飞机的凝结尾气通常呈现为白色，但向着落日方向的反射凝结尾却呈现出红色的光晕。飞机的后面是一弯蛾眉月，也略略红化了。这是一个月前在瑞士瓦莱斯上空被拍到的景象，出现在日落后不久，此时天空中的飞机仍然处于阳光之中。数分钟内，天空中的这场即兴演出就结束了。飞机穿越月亮，飞出视线以外。月亮也落山了。