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My interest in the ideas that, by very circuitous routes, led to this book, started about fourteen or fifteen years ago. Because of a change in the science curriculum at the Dwight-Englewood School, I had to teach earth science to eighth graders, a field about which I knew very little. That had its difficulties (staying a day or two ahead of the students), but it also had its advantages: since not a lot was expected of me I was free to experiment in the course. I was especially able to do this in a small honors class of about ten students that I was lucky enough to be teaching. During the astronomy section (traditionally part of an earth science curriculum), since the book only showed the relative sizes of the planets, we decided to make a true scale model of the solar system. We did the math, reducing the size of the solar system by a factor of about 10 billion. The Sun became a little larger than a softball, Jupiter the size of a marble, and the smaller planets, including the Earth, had to be represented by the head of a pin. We set the model up on Dwight-Englewood's campus, putting the Sun near one end. Then the pinhead representing Earth was about 50 feet away, Jupiter about five times as far away as that, and Neptune (the farthest planet at that time) on the other side of the campus, about 1400 feet away.
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