Explanation about the gases, color, and size of stars

Stars are living like people do; they are born, live a long mid-life, and eventually die. Stellars are different sizes and colors that become giant balls of hot gas and change as they age, but it doesn't take change until over billions of years later. Astronomers have a strong sense of how stars are on the inside and out. Stars colors change because of their temperature. The coolest stars are the color of red and …

…and black the not even light could escape from the hole, once something falls in, it could never escape. If the world had not composed stars, we as people would not be alive. Hydrogen and Helium are the main element to construct everything around us. When stars explode at the end of their lives, atoms are thrown all over space and re-gather to form a new nebula and begin a new life of a star.