图书标签: IrvingAdler
发表于2024-11-23
Seeing the Earth from Space pdf epub mobi txt 电子书 下载 2024
Looks Can Be Deceiving<br > SCIENTISTS tell us that the earth is round.<br >It is a big ball, they say, about eight thousand miles<br >wide. It is spinning around like a merry-go-round, and<br >is sailing through space at a speed of 18~ miles per<br >second, or 66,600 miles an hour. It revolves around the<br >sun, making a complete round trip every year. The<br >first time we hear these facts they are hard to believe,<br >because they do not seem to match the way things<br >look. If we stand outdoors and took around us, what<br >we see of the earth doesn t look like a ball at all. It<br >looks more like a flat cake of soil and rock, with a<br >smooth surface where we see plains, and with bumps<br >and wrinkles where we see hills and mountains. We<br >don t feel the earth moving or spinning. In fact, it<br >seems to be standing perfectly still. And when we<br >watch the sun, as it rises in the east, climbs across the<br >sky, and then sets in the west, it looks as though the<br >sun is going around the earth, rather than the other<br >way around.<br > But things aren t always the way they seem. The<br > earth/s round, does spin, and does revolve around the<br > sun. For thousands of years this truth was hidden from<br > 7<br >
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Seeing the Earth from Space pdf epub mobi txt 电子书 下载 2024