แปลเนื้อเรื่องAstronomers have studied the universe for centuries. In fact, astronomy began in Ancient Mesopotamia. The first astronomers were priests, and in those days astronomy was like astrology. Things have changed since then.
Today, photography and the telescope have helped astronomers to see the distant stars and to know more facts about the universe. We have discovered that our Earth and the sun are part of a galaxy of 10 billion stars and we know more about how the Earth began. Cosmology has made big steps in the 21st century. Some astronomers have collected evidence and believe the universe began with a Big Bang about 14 billion years ago.
At that time, the entire universe was inside a bubble. This bubble was very small and it was incredibly hot. Then the bubble suddenly exploded and the universe was created. According to this theory, time and space began with the Big Bang. Nobody has discovered what was before it. In less than a second, the universe grew form a single atom to bigger than a galaxy. It has not stopped growing. Since then, the universe has grown and grown at a very high speed.
There are millions of galaxies and ours is the Milky Way. Other galaxies are billions of light years away and there are more that astronomers have not yet discovered. So… Is there life on other planets? Have aliens ever visited our planet? Can people from Earth live on other planet? These are just some questions astronomers have not answered yet. And their research goes on