Extremely energetic light from space is an unexplained wonder. Scientists don’t know where that light comes from, exactly. And now astronomers have spotted this light, called gamma (伽马) rays, at higher energies than ever before.

You can’t see gamma rays with your naked eyes (肉眼). They are much more energetic than the light that we can see. So you need a fancy detector to spot them. The Large High Altitude Air Shower Observatory, LHAASO, is an experiment in China. It searches for extremely high energy gamma rays.

Scientists have spotted 12 gamma-ray hot spots. These are parts of the sky from which the gamma rays are sent out. Those hot spots show that our galaxy (银河系), the Milky Way, has powerful particle accelerators (粒子加速器). But those particle accelerators aren’t made by humans. Instead, they come from violent events in the universe. They might be exploding stars, for example. Such violent events make electric and magnetic fields, which can speed up protons (质子) and electrons. Those fast particles can then produce gamma rays with a lot of energy. That can happen when protons interact with other matter in space, for example.

Scientists aren’t sure what could produce gamma rays with the extreme energies observed. But the new observations point to two possibilities. One hot spot was associated with the Crab Nebula. That’s the remains of an exploded star. Another possible source was the Cygnus Cocoon. That’s a region where massive stars are forming. The stars send out strong winds in the process.

LHAASO is located on Haizi Mountain in China’s Sichuan province. It is not yet fully operational. It’s due to be completed later this year. Then, it could find even more gamma rays.

Stephen Hawking, one of the world’s most famous scientists, believed that to survive, humans will one day have to move into space. “Once we spread out into space and establish independent settlements, our future should be safe, ”he said.

Today, several leading countries in space exploration are all planning to send astronauts-people who travel into space - back to Earth’s closest neighbor: the moon. Some of these countries want to create space stations there within the next 10 years. These stations will prepare humans to visit and later live on Mars or other Earthlike planets.

Robert Zubrin, a rocket scientist, thinks humans should take control of space. He wants to start with Mars. Why? He thinks sending people to Mars will allow us to learn a lot of things-for example, the ability of humans to live in a very different environment. Eventually, we could create new human societies on other planets. In addition, any advances we make in the fields of science, technology, medicine, and health will benefit people here on Earth.

Not everyone thinks sending humans into space is a smart idea. Many say it’s too expensive. Also, most space trips are not short. A one-way trip to Mars, for example, would take at least six months. People traveling this kind of distance could face many health problems In addition, these first people would find life extremely difficult in space. On the moon, for example, the sun’s rays are very dangerous. People would have to stay indoors most of the time

Despite these concerns, sending people into space seems certain. In the future, we might see cities on the moon or even new human cultures on other planets. First stop: the moon

I read with interest a recent article on Galactocorp’s planned Shuttlejet flight later this year. I cannot imagine more stupid thing than this, so-called space tourism, and can’t help wondering what on earth humanity is coming to if this can be successful business.

Many may think that space travel is the highest human achievement, which may be the condition when scientific endeavor (努力) is the aim. However, when it comes to space tourism, think we may have found the top of human stupidity. Consider the high cost of getting into space, the billions of dollars wasted on building the Shuttlejet, and the many thousands spent by the passengers—and for what? So that forty fat cats can have a first-class meal along with six minutes of weightlessness, before returning to earth? Never before has so much money been spent for so little benefit (利益). I invite all space tourists to come around to my house. I can treat them to a big dinner and they can have jump on the trampoline (蹦床), and they’ll only need to pay me half the price of Galactocorp.

Further, the money can be used in a smarter way. Think of the many worthy causes that would benefit from the money that has been thrown away on this project already. There are many medical programs in those poor countries. A few hundred thousand dollars could make a big difference to the lives of thousands of people. The benefits would last far longer than six minutes.

Not only is the Shuttlejet a terrible waste of money, it’s also a terrible waste of resources (资源). Think about the materials required to build and the things required to drive the Shuttlejet. Do we really want to pollute the environment for such a pointless exercise and waste so much money for such a pointless exercise?

In a word, we all need to come back down to earth and forget this stupid dream of space tourism.