DART：对小行星Dimorphos的影响
(原标题: DART: Impact on Asteroid Dimorphos)
2022-09-27
浏览次数: 20
人类能改变一颗向地球飞来的小行星的方向吗？是。地球过去曾发生过来自大型小行星的致命撞击，有时会导致生物大规模灭绝。为了保护我们的地球免受一些潜在的未来撞击，美国宇航局昨天测试了一种新的行星防御机制，将机器人双小行星重定向测试（DART）航天器撞向Dimorphos，这是一颗直径约170米的小行星。正如专题视频所示，这次撞击是成功的。理想情况下，如果撞击得足够早，即使是小航天器的撞击也能使一颗大小行星偏离地球。在视频中，可以看到DART在延时视频中首先经过左边较大的didyphos，然后接近较小的Dimorphos。尽管视频以DART的坠毁突然结束，但世界各地的航天器和望远镜对Dimorphos轨道变化的观测才刚刚开始。
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Could humanity deflect an asteroid headed for Earth? Yes. Deadly impacts from large asteroids have happened before in Earth's past, sometimes causing mass extinctions of life. To help protect our Earth from some potential future impacts, NASA tested a new planetary defense mechanism yesterday by crashing the robotic Double Asteroid Redirection Test (DART) spacecraft into Dimorphos, a small asteroid spanning about 170-meters across. As shown in the featured video, the impact was a success. Ideally, if impacted early enough, even the kick from a small spacecraft can deflect a large asteroid enough to miss the Earth. In the video, DART is seen in a time-lapse video first passing larger Didymos, on the left, and then approaching the smaller Dimorphos. Although the video ends abruptly with DART's crash, observations monitoring the changed orbit of Dimorphos -- from spacecraft and telescopes around the world -- have just begun.