经过贝皮可伦坡的水银
(原标题: Mercury from Passing BepiColombo)
2022-06-28
浏览次数: 16
这是月球的哪一部分？没有，因为这是水星。水星古老的表面像月球一样布满了环形山。水星虽然只比月球大一点，但密度和质量都比太阳系的任何卫星大得多，因为它主要是由铁构成的。事实上，我们的地球是唯一一个密度更大的行星。因为水星每绕太阳两圈就自转三圈，而且水星的轨道是椭圆形的，所以水星上的游客可以看到太阳升起，停止在天空中，回到上升的地平线，再次停止，然后迅速落在另一个地平线上。从地球上看，水星离太阳很近，只能在日落之后或日出之前的一小段时间内看到它。这张特色图片是上周由ESA和JAXA经过的BepiColombo宇宙飞船拍摄的，当时它正在释放能量，准备从2025年开始绕最内侧的行星运行。
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Which part of the Moon is this? No part -- because this is the planet Mercury. Mercury's old surface is heavily cratered like that of Earth's Moon. Mercury, while only slightly larger than Luna, is much denser and more massive than any Solar System moon because it is made mostly of iron. In fact, our Earth is the only planet more dense. Because Mercury rotates exactly three times for every two orbits around the Sun, and because Mercury's orbit is so elliptical, visitors on Mercury could see the Sun rise, stop in the sky, go back toward the rising horizon, stop again, and then set quickly over the other horizon. From Earth, Mercury's proximity to the Sun causes it to be visible only for a short time just after sunset or just before sunrise. The featured image was captured last week by ESA and JAXA's passing BepiColombo spacecraft as it sheds energy and prepares to orbit the innermost planet starting in 2025.