Would you like to take a trip to the moon? People have already landed on the moon. Some day, the moon might become a popular place to visit. How will a trip to the moon be? Here are some facts.

There is no oxygen (氧气) or water on the moon. In order to stay alive (活着), you would have to take your own oxygen and water. It is silent (寂静地) on the moon. Sounds can’t be carried from place to place because there is no air. On the moon, the temperature goes down to 240℃ below (在……以下) 0℃ at night, and it warms up to 212℃ above 0℃ during the day.

What will the surface (表面) of the moon look like? The moon has more than 30,000 holes on it. One of the biggest is 146 miles wide.

When you walk on the moon, you’ll feel light on your feet. That’s because you weigh only about 20 pounds on the moon. You might forget what day it is there because a moon day lasts for two weeks. But you won’t need an umbrella anymore because it never rains on the moon. And the weather on the moon never changes at all.

Are we alone in space? Is the Earth the only planet that has life? 【小题1】 Now we may get one step closer to the answers.

On Feb. 22nd, NASA said they found seven Earth-like planets. 【小题2】 The planets go around a dwarf star（矮星）called Trappist-1. It is much smaller and cooler than our sun. They are about 39 light-years（光年）from the Earth. 【小题3】 But scientists say it’s a little close.

【小题4】 If you lived on one of them, you could possibly see the clouds around the next planet. More importantly, three of the planets are at the perfect distance（距离）from the Sun. 【小题5】 If there is liquid water（液态水）, there could be life.

For scientists, the finding is not an end. Next, they will try to find out if the planets have atmospheres（大气层）.

As space science develops, man has learned more and more about space. Space is not only amazing but also dangerous. While working in space, spacemen are facing danger.

Scientists have found out that radiation (辐射) is the greatest danger to spacemen in space. When spacemen are working in space, they are in danger of radiation from the sun and other stars, which is bad for their health. The damage done by radiation won’t be discovered until their children or even grandchildren are born. Some special medicine may work a little, but no really helpful medicine has been found.

Space junk is also thought to be a great danger to spacemen. It’s reported that there are 9,000 man-made things flying in space. About 30% of these are man-made satellites (卫星), 10% are spaceships, and the rest are space junk. An explosion (爆炸) in 1999 made a cloud of 300,000 fragments , each at least 4mm in size, and even a small piece of these knocked against a spaceship window and did some damage. Scientists are watching and reporting any possible danger all the time. They are working on helpful ways to deal with space junk.

Although space is really dangerous, it interests everyone on the earth. In the near future, it may become usual for people to spend a few days in a space hotel. We may even choose to leave the earth and live in space in a few years. So we should care for space and do something to help improve the space environment.