Our reporter asked people what they were doing on July 20th, 1969 when man first walked on the moon. Here is what they said:

Kate Jones, waitress I remember that day very well. I was fifteen years old. It was a hot and humid day, and I was with my family in the mountains. We were having a picnic. We didn’t see the moon landing when it happened, but we were thinking about it. We saw it later on the TV news.

John Bates, postman I was eighteen years old. It was a very exciting day. I was watching TV at home when the astronaut walked on the moon. His name was Neil Armstrong. I remember he could jump really high because people aren’t so heavy on the moon. When he returned, he became a national hero in America, and famous all over the world.

Paul Robinson, doctor I was twelve. I remember the day, but I don’t remember what I was doing. I remember I wanted to go to the moon, too. My dream was to become an astronaut and fly in a rocket. I wanted to see the earth from the moon. The astronauts on the moon said that the earth looked very beautiful from there.

Linda Brown, clerk I was working that day. I was twenty then. I didn’t see the man land on the moon because I was busy. Of course I knew about it. I read about it in the newspaper the next day. I thought it was amazing. Maybe one day people will travel to the moon for vacations!

Mark Green, teacher I was only seven years old then. My parents talked about it, and I learned about it later in school, but I don’t remember the day. I was too young to remember. Maybe I was having fun in the playground with my friends when it happened.

Many people know that rubbish is a big problem on the planet Earth. What many people don’t know is that junk（垃圾）has become a problem in outer space too.

According to BBC News, there are more than 22, 000 pieces of space junk floating around the earth. And these are just the things that we can see from the surface of the earth by telescopes （望远镜）. There are also millions of smaller pieces of junk that we can’t see.

Objects, like bits of old space rockets（火箭）or satellites（卫星）, move around the planet at very high speed so fast that even a very small piece can break important satellites or become dangerous to astronauts. If the tiniest piece of junk crashed into a spaceship, it could damage （损害）the space tool.

To make things worse, when two objects in space crash, they break into many smaller pieces. For example, when a U.S. satellite hit an old Russian rocket in 2009, it broke into more than 2,000 pieces, increasing the amount of space junk.

To reduce additional （额外的）space junk, countries have agreed that all new space tools can only stay in space for 25 years at most. Each tool must be built to fall safely into the earth’s atmosphere （大气层）after that time. In the upper parts of the atmosphere, it will burn up.

Many scientists also suggest different ways to clean up space junk. In England, scientists are testing a special net that can be sent into space junk. The net catches the junk and then pulls it into the earth's atmosphere to burn up. The Germans are building robots that can collect pieces of space junk and bring them back to Earth to be safely dealt with.

“The problem is becoming more challenging because we’re sending more objects into space to help people use their mobile phones and computers,” says Marco Castronuovo, an Italian space researcher.

China has named the nation’s first Mars rover（火星车）ZhuRong. For all of us, Zhu Rong is a well-suited name.

In an ancient Chinese story, Zhu Rong had the face of a man and the body of an animal. H rode on two dragons. When he had a big fight with Gong Gong, the god of water, Zhu Rong won. But after the fight, the human world came into complete darkness. Then he brought fire from heaven（天国）to the world.

“Zhu Rong is regarded as the earliest god of fire in traditional Chinese culture,” a space official said. “The first Mars rover was named Zhu Rong. The name symbolizes（象征）light and hope for space exploration（探索）in our country, and means to guide humans to continue exploration.”

After leaving the earth last summer, Zhu Rong circled Mars for several months and landed on it in May. In recent years, our country has sent up the world’s first quanturn satellite（量子卫星）, and Chang’e-4 has made a soft landing on the moon. We have made great progress in space technology and will soon start building our own space station.