文章列表

• 1.Why Is the Moon Sometimes Round and Sometimes Not？
• The moon， like the earth， is round all the time. Why then does the moon we see everyday change its shape？ The moon does not shine by itself. It is ...
• 2.What Is on the Moon？
• Like the earth， there are mountains， valleys and flat land on the moon. However， on the moon there are no trees in the mountain， there is no water...
• 3.Why Does the Moon Always Follow You Wherever You Go?
• When you travel by train and look out the window， you'll feel the lamp posts and houses all run backwards. But when you look carefully， you'll find ...
• 4.Which Is Bigger, a Star or the Moon?
• Let's do a simple test first. Take a big balloon and a small apple and put them together. Which is bigger？ The balloon， of course. Now， put the app...
• 5.Which Is Bigger, the Sun or the Moon?
• The sun appears to be as big as the moon. A dually， the sun is 100 million times bigger than the moon. So why does the sun look just as big as the mo...
• 6.Why Can't We See the Sun at Night?
• During the day time we can see the sun， but we cannot see it after sunset. Why is that？ The earth revolves all the time. During the day the earth fa...
• 7.How Can the San Be Covered by Clouds Since It Is Much Bigger Than the Earth?
• Our hands are small. But if you put one hand over your eyes， you won't be able to see the sky. When we look at things， those near us always appear b...
• 8.Can the Sun Bum Out?
• The sun brings us light and warmth. But what can we do if the sun burns out？ There is no need to worry. The sun is like a big stove using atom energy...
• 9.Is the Sun a Big Fire Ball?
• Although the sun is over one million kilometres away from us， we still feel its heat. In this sense， we can say that the sun is a very big fire ball...
• 10.Why Does the Sunny Sky Look Blue?
• In the sky there is a very thick layer of air which is colourless. So why does the sky look blue？ It has something to do with the irradiation of sunl...