A star is a ball of gas that is so hot. It burns and glows. If you look at the sky on a clear night, you will be able to see constellations of stars. The stars in each constellation are named after letters the Greek alphabet .For thousands of years sailors used the stars to navigate. They were able to tell in which directions they were traveling.
Galaxies are giant grups of stars. Each galaxy consists of millions and even trillions of stars. Most galaxies are one of four shapes: spira,irregular,oval,and elliptical. Our own galaxy is the milky Way.
lt is made up of 100 billion stars. The milky way is in the shape of a spiral. Nebulae are seen as fuzzy patches of light as you look at the night sky.They are actually giant clouds of space dust gas where new stars are born and old stars die.The Great Nebula of Orion can be seen with the naked eye.