A nuclear reaction something like the hydrogen bomb causes stars to shine. Hydrogen is transformed into helium and about one percent of its mass is transferred into heat energy. This energy keeps the temperature at the center of the star at millions of degrees. Our sun moves about 12 miles per second towards the constellation Hercules. All stars move, some even up to 84 miles per second.
Astronomy is one of the oldest sciences.
Thousands of years ago people would watch the stars. They would play a game like connect the dots and imagine pictures of their gods and heroes. Sometimes they would make up stories to go with the pictures. Sailors would use the stars to guide them. The Egyptian, Chinese and Europeans all had astronomers in their royal courts.