The sun and all the stars we see in the night sky belong to a great group of stars that travel through space together. such a group is called a galaxy. the star group to which our system belongs is called the milky way or just the galaxy. there are about 100,000,000,000 stars in the galaxy the milky way is not the only galaxy in space. in fact, there are thousands of millions.where will people go after they've explored their own solar system? later, they'll build new starships and go further to investigate the universe.как читается по
