Here are the first four sentences of Jeans's first paragraph. Did you predict what he would write about next? If you did, what clues did you use? If you did not, what clues in the first three sentences predicted what his fourth sentence would be?

Because of the way it came into existence, the solar system has only one-way traffic, like Piccadilly Circus. The traffic nearest the center moves fastest; that further out more slowly, while that at the extreme edge merely crawls, at least by comparison with the fast traffic near the center. It is true that even the furthest and slowest of the planets covers nearly three miles every second, which is about 200 times the speed of an express train, but this is a mere crawl in astronomy. The planets Mercury and Venus, which constitute the fast traffic near the center, move, the former ten and the latter seven, times as fast.

Did you notice how, in the next sentence, he gives an example of planets which represent the fast traffic in the center? Do you see how his sentence helps you to see more clearly how the inner planets are really moving so much faster than the planets at the outer edge of the solar system?

Okay, now what do you think he will do in the last sentence of this paragraph? Read all of the sentences, make your prediction, then click on NEXT to find out if you are right.

Because of the way it came into existence, the solar system has only one-way traffic, like Piccadilly Circus. The traffic nearest the center moves fastest; that further out more slowly, while that at the extreme edge merely crawls, at least by comparison with the fast traffic near the center. It is true that even the furthest and slowest of the planets covers nearly three miles every second, which is about 200 times the speed of an express train, but this is a mere crawl in astronomy. The planets Mercury and Venus, which constitute the fast traffic near the center, move, the former ten and the latter seven, times as fast. NEXT