The problem-solving prizes 为鼓励创新和解决问题设置“挑战奖” Episode 180528 / 28 May 2018 What's a challenge prize?

A red Moon in June? 从规律的盈亏圆缺到罕见的色彩幻变，月亮总是带给人无限惊喜。为什么月相的变化如此有规律？哪些瑰丽的月色又是如何形成的？本文浅谈月亮外形的变化规律和背后的原因。 词汇：astronomy 天文学 1 You may have heard of the idiom 'once in a blue moon' to describe an event that ...