2021年02月20日

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Perseverance: How to Land on Mars
Image Credit:
NASA, JPL, Mars 2020

Explanation: Slung beneath its rocket powered descent stage Perseverance hangs only a few meters above the martian surface, captured here moments before its February 18 touchdown on the Red Planet. The breath-taking view followed an intense seven minute trip from the top of the martian atmosphere. Part of a high resolution video, the picture was taken from the descent stage itself during the final skycrane landing maneuver. Three taut mechanical cables about 7 meters long are visible lowering Perseverance, along with an electrical umbilical connection feeding signals (like this image), to a computer on board the car-sized rover. Below Perseverance streamers of martian dust are kicked-up from the surface by the descent rocket engines. Immediately after touchdown, the cables were released allowing the descent stage to fly to a safe distance before exhausting its fuel as planned.

Tomorrow’s picture: the stars in a rose


毅力号:如何着陆火星
影像提供:
NASA, JPL, Mars 2020

说明: 在这幅2月18日摄于着陆火星之前瞬间的影像里,毅力号悬垂在降落器火箭的下方,距离火星表面只有数公尺之遥。这幅令人屏息的俯视景观,为从火星大气顶端开始的激烈7分钟之旅画下句点。这张摄于降落器的影片定格,记录出动天空起动机着陆火星的最后阶段。影像里,3条长7公尺的绷紧机械索正在垂放毅力号,其旁的电气连接索,则把讯号(诸如这幅影像)传输到这部房车小的火星车之电脑里。在毅力号下方,可见到降落器火箭引擎在火星表面扬起的尘缕。在毅力号着陆之后,这些索具立即断开,让降落器在耗尽燃料之前,能飞到安全的距离之外。

明日的图片: the stars in a rose

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