Some nights the Moon looks like a perfect circle, other nights just a sliver. These changes in its shape are to do with the lunar cycle. This is a series of eight unique phases of the Moon's visibility. The whole cycle takes about 29.5 days and these different phases happen as the Sun lights up different parts of the Moon whilst it orbits Earth.
В российском городе дерево рухнуло на жилой дом20:51，更多细节参见PDF资料
，详情可参考PDF资料
Фото: Vlad Smilianets / Reuters，推荐阅读heLLoword翻译官方下载获取更多信息
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2.0 mm³ isotropic