标签： solar wind

天文·每日一图

坠毁在犹他州沙漠的飞碟

2022年11月13日 Flying Saucer Crash Lands in Utah Desert Image Credit: USAF 388th Range Sqd., Genesis Mission, NASA Explanation: A flying saucer from outer space crash-landed in the Utah desert after being tracked by radar and chased by helicopters. The year was 2004, and no space aliens were involved. The saucer, pictured here, was the Genesis sample return cap...

天文·每日一图

李奥纳德彗星摇摆的彗尾

2022年1月10日 Comet Leonard’s Tail Wag Image Credit: NASA, NRL, STEREO-A; Processing: B. Gallagher Explanation: Why does Comet Leonard’s tail wag? The featured time-lapse video shows the ion tail of Comet C/2021 A1 (Leonard) as it changed over ten days early last month. The video was taken by NASA’s Solar Terrestrial Relations Observatory-Ahea...