1800年7月31日,德国化学家维勒诞生,他一生获得的荣誉纪念物多达317种。维勒发现了元素铝和铍,1828年他又首先用人工方法合成尿素。
1964年7月31日,美国“徘徊者-7号”宇宙飞船向地球发回首批月球近景照片,这是自伽里略以来,人类在月球天文观测方面取得的最大的成就。
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