The largest stars are supergiants and very small stars are dwarfs . There are many stars hotter than the Sun. The hottest stars are bluish in color. Stars with a medium temperature are yellowish and the coolest stars are reddish. As starlight travels through Earth's atmosphere it makes some stars look like they are twinkling.
Stars live for billions of years.
After a star explodes it is called a supernova . The light it gives off when it explodes is brighter than a million stars. A black hole is the collapse of a supernova under the force of its own gravity. Nothing nearby can escape from the black hole . The Sun is eight light minutes from us.