Many scientists believe that intelligent life forms may exist on other planets and messages should be sent into space to contact these life forms. Other scientists think this is a bad idea because these life forms could be dangerous. Discuss both these views and give your own opinion. Give rea...
They aren't sure if there is any water and air for living things to live on other planets. People always ask the question: Is there anyone out space? Our scientists haven't got a clear answer either. Some people think it will be a secret for a long time. But we believe we can ...
Whether you are a science fiction fan, a space enthusiast or one of the millions who have watched astronauts gamboling about the moon's surface, you may have wondered how much you would weigh on other planets in the solar system. To sort this out, it first helps to know a little ...
3. Traveling to other planets or to the moon will also be available for everyone. Means of transport will, of course, change, too. We will be using solar-powered cars, which will be much more environmentally friendly. We could expect that the faster technological progress would lead to a ...
Would you like to walk a pig down your street? They can be trained to do tricks, and they like to be petted. They usually get along with other pets. Pet pigs must be kept on a diet (节食). They like to eat like hogs (肉猪)! 4 An adult pet pig should not weigh more than ...
B. The Sun: Essential for Life on Earth Life as we know it would not be possible without the heat and light of the sun.Through the process of photosynthesis, the sun-along with water and carbon dioxide-enables plants to grow. In turn, the carbohydrates in plants form the primary source...
B:Maybe.But I want to live on the earth.A:Me,too.(5) BB:We can use less water and plant more trees.Everyone should play a part in saving the earth.A.So what will the future be like?B.Then what can we do?C.Will we have to move to other planets?D.D...
Seeing how the past is unfolded, I was curious about what the next 30 years would look like.看到过去是如何发展的，我很好奇接下来的三十年会是什么样子。So why did a little digging into what life might look like in 2050 for us.那么，深入研究2050年的生活是什么样子吧。Let's take a look....
Why do we have day and night? When the half of the Earth is facing the Sun, it’s daytime. As the Earth turns and this half is away from the Sun, night is coming. And it’s daytime for the other half. 1.How many planets are running around the Sun?
4. Why don't the orbits of planets decay and cause them to crash into each other?4.为什么行星的轨道不衰减并导致它们相互碰撞?5. When will the universe die? Will it continue to expand?5.宇宙何时消亡?它会继续膨胀吗?6. Is it possible to live permanently on another planet?6.我们有可能在...