Book About Stars and Planets by Yefrem Levitan

By Yefrem Levitan

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Sample text

The shadow's smaller," said Sveta. " Then Father changed the position of the lamp several times, raising it and lowering it, and the children saw the shadow grow longer and shorter in turn. Then Father began to move the lamp in his outstretched hand, and the children saw the shadow move. "Then the shadow of the stick lit up by the sun must also change," Sveta said. 33 Sometimes travellers found out the time with the help of the noonday Sun The mass of the Sun is nearly 330,000 times greater than the Earth's "Of course it'll change.

He doesn't need much time. " Alex said in admiration. " Sveta remembered. "He already has," answered Father. "With his help we have learned that the Sun is very, very far away. Even Ray who is very fast takes 8 minutes to travel from the Sun to the Earth. Scientists have worked out that Ray flies one hundred fifty million kilometres in that time. " "I don't understand how Ray told us that," Alex said thoughtfully. " said Alex. "You see. The rays travelled an enormous distance from the Sun but they still' warmed us.

Planes flew above in the blue sky. The children watched with interest how a tiny plane would appear in the distance and then grow bigger before their very eyes and how a big plane became smaller and smaller as it flew off. " asked Alex. "No, they don't. They're the same in the plane as they are here on Earth," answered Father. " "Yes, it only seems smaller," Father agreed. "Any object, even the biggest one, seems small at a long distance from us. The further away it IS, the smaller it seems. " "Yes," the children answered.

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