科学家发现,地球每天的时间都比前一只延长1/700秒,也就是每过去一年,一天的时间就要延长0.5秒,每过一个世纪,大约延长一分钟。 据推算,在15亿年前的地球形成之初,一天只有1小时;到了40亿年前,一天的时间增加到8小时;距今(?)亿年前,一天约为18小时,一年约为(?)天;距今5.7亿年前,一天约为2(?)小时,一年约为421天。由此可看 Scientists have discovered that the Earth’s daily time is extended by 1/700 second over the previous one, that is, each time of the past year, the time of the day is extended by 0.5 seconds, and every one century is extended by about one minute. According to calculations, at the beginning of the Earth’s formation 1.5 billion years ago, it was only one hour a day; by 4 billion years ago, the time of one day had increased to 8 hours; it was about 18 hours (a year) ago, and it was about 18 hours a day. About (?) days; 570 million years ago, about 2 (?) hours a day, about 421 days a year. This can be seen