As you are reading this story, there are a lot of things flying through space. These things are called space junk (太空垃圾).

Space junk comes from many different kinds of things such as old spaceships. These things travel very fast in space.

According to NASA, there are about 500,000 pieces of junk in outer space. Some of these pieces of junk are traveling as fast as about 28,163 kilometers per hour. This can be even faster than a spaceship. Even a small piece of junk can destroy(毁坏) a spacecraft or satellite.

Luckily, NASA has found a way to solve this problem. It made a special satellite called Nano Racks-Remove Debris. The satellite looks like a cube(立方体). It works by collecting small pieces of space junk. There is a 3-D camera on the satellite. It can find where the space junk is, how big it is and how fast it is moving. When it gets close to the space junk, it uses a net to catch it. Later, the satellite burns the space junk in Earth’s atmosphere (大气层).

4 . Tourism is often about seeking deeper emotional and personal connections with the world around us. Not all travel experiences, however, need to take place in the real world. With the evolution of virtual reality (VR) technology, tourism will increasingly become a combination of physical and virtual worlds. VR may even remove the need to travel entirely.

But can a VR experience really equal a real world one? Many experts believe it can. Studies have shown that our brains have an inbuilt VR—like mechanism that enables us to live imagined experiences. Much of our waking life is spent thinking about either the past or the future. This is known as “mind wandering”. During these events we’re not paying attention to the current world around us. Instead, we’re recalling memories, or creating and processing imagined futures.

When engaged in mind wandering, our brains process these mental images using the same pathways used to receive inputs from the real world. So, the imagined past or future can create emotions and feelings similar to how we react to everyday life. VR can create these same feelings.

While critics might argue that a virtual experience will never match reality, there are several ways VR tourism could make a positive contribution. Firstly, it could help protect sensitive locations from overtourism. In recent years famous sites such as Maya Bay in Thailand, have had to limit the number of visitors because of their negative impact. These places are now producing their own VR experiences that will allow tourists to pass through virtual models of the sites. Virtual reality may also allow people back in time, to experience historical events, visit ancient cities, and even to walk among dinosaurs.

Finally, in a world where many people suffer from stress and depression due to overwork, virtual tourism may provide a cheap and convenient way for people to take brief holidays to otherwise unreachable destinations and recharge （充电）their batteries, without ever leaving their homes.

It sounds like science fiction but it’s already happening. As virtual technology improves and as people continue to demand new and interesting experiences, more virtual tourism will be expected, both in combinations with the real world and instead of it.

5 . Argentina’s quarter-final match against England in the 1986 World Cup will always be remembered for Maradona’s two goals: The first, an opportunistic handball — which somehow worked. His second, scored minutes later, is known simply as the Goal of the Century: an amazing seventy-yard run with the ball glued improbably to his left foot, as English defenders flail (使劲乱摆) helplessly to the side. The iconic Argentine-television narration sums up the feeling: “Diego,” the breathless announcer shouts, “what planet are you from?”

Somehow, after winning the World Cup two matches later, it all went wrong. As if Kapadia’s remarkable new documentary, “Diego Maradona”, takes a revealing look at the emotional cost of fame and shows how disposable talent can be, no matter how impressive the gift.

The documentary really begins in July, 1984, when Barcelona sold Maradona to Napoli (for what was then a world-record fee). One of the world’s greatest players was sold to a club in Italy’s poorest and most violent city. In the first press conference, when a journalist dares to ask what many must have wondered: Did the local Mafia (黑手党) have anything to do with financing this deal? Maradona dissembles for a moment, before the president of the club steps in to reject the notion angrily.

The film argues convincingly that Maradona’s greatest sporting achievement was not the 1986 World Cup victory with Argentina but the two scudettos (意甲联赛) that he won with Napoli, in 1987 and 1990, which turned the league upside down and angered the traditional powerhouses. The hateful criticism directed at Napoli and its fans was an expression of a national divide between the North and South. Yet, the on-field footage is stunning and the Neapolitans flattered him by saying “their city is visited by an angel in soccer sneakers”.

The defining moment came during the 1990 World Cup in Italy. Maradona, playing for Argentina and already hated by most Italian fans because of his association with a despised club, was booed (喝倒彩) everywhere he played. Argentina met Italy in the semifinals. When Argentina beat Italy, Maradona became the most hated man in the country. The next season, back at Napoli, he faced fury unlike any he’d ever encountered. Soon afterward, he was caught in scandals, the league banned him from the game for more than a year, and he returned to Argentina in disgrace.

On the day of his 2001 testimonial (纪念赛), Maradona took the microphone with arms folded across his chest. “Soccer is the world’s most beautiful game,” he said, and nothing he’d done should be held against the sport itself. “I made mistakes, and I paid for them,” he said. The entire stadium roared back its forgiveness, and he paused for a second, before continuing. “But the ball is never stained.”