The earth moves round the sun,and the moon moves round the earth.When our part of the earth turns to the sun,it is day. When our part of the earth turns away from the sun,it is night.
The sun is bigger than the moon.But sometimes the moon looks bigger than the sun,because it is much nearer to the earth.
The sun is very bright.It gives very strong light.The moon looks quite bright,too,but it doesnt give any light at all.The light from the moon comes from the sun.
The moon looks much bigger and brighter than the other stars.But in fact many stars are much bigger and brighter than the moon.They look smaller than the moon because they are farther away from the earth.
地球绕着太阳转，月亮绕着地球转。当我们这边的地球转向太阳，就是白天。当我们这部分地球远离太阳，就是黑夜。
太阳比月亮大。但有时月亮看起来比太阳大，因为它离地球近得多。
太阳很亮。它发出很强的光。月亮也看起来很明亮，但它不会产生任何光。月亮的光来自太阳。
月亮看起来比其他的星星更大更亮。但事实上许多星星比月亮大得多亮。它们看上去比月亮小是因为它们离地球很远。