火星月亮月食
(原标题: Martian Moon Eclipses Martian Moon)
2024-02-26
浏览次数: 10
如果天空中有两个月亮，它们互相遮挡会怎样？这发生在火星上。这段特色视频从太空中展示了这次不寻常的日食。图为火星的两颗卫星：较大的火卫一，它的轨道离火星更近，较小的火卫二，它的轨道离火星更远。这一序列是去年由欧洲航天局的火星快车拍摄的，这是一艘绕火星运行的机器人航天器。从火星表面可以看到类似的日食，尽管很少。然而，从表面上看，较近的卫星火卫一似乎会从较远的卫星火卫二前面经过。最奇怪的是，火卫一绕火星运行的距离如此之近，以至于与地球的月球相比，它似乎是向后移动的，从西边升起，从东边落下。火卫一是距离较近的卫星，它的轨道非常近，速度也非常快，每天大约三次从头顶飞过。
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What if there were two moons in the sky -- and they eclipsed each other? This happens on Mars. The featured video shows a version of this unusual eclipse from space. Pictured are the two moons of Mars: the larger Phobos, which orbits closer to the red planet, and the smaller Deimos, which orbits further out. The sequence was captured last year by the ESA’s Mars Express, a robotic spacecraft that itself orbits Mars. A similar eclipse is visible from the Martian surface, although very rarely. From the surface, though, the closer moon Phobos would appear to pass in front of farther moon Deimos. Most oddly, Phobos orbits Mars so close that it appears to move backwards when compared to Earth's Moon from Earth, rising in west and setting in the east. Phobos, the closer moon, orbits so close and so fast that it passes nearly overhead about three times a day.