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Time travel is really cool! You can change the past. And you can find out what will happen in the future. Butis time travel just in many sci-fi? Or is it real?
People might travel to the future someday. But we have to make a special spaceship. The spaceship has to be as fast as light. When you travel at that ,time goes slower for you than it does for people on Earth. For example，you spend seven days on the spaceship. But people on Earth spend 100 years. When you go back to Earth，you are in the future.
What about traveling to the past? Scientists are not sure. But some believe through a black hole might be one way to do this. Things around black holesinto the holes. They must go somewhere. Perhaps they go to the past.
