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Nick Stars change • It may take millions to billions of years for a star to change .Some stars change into different things such as black holes, supernovas and different size stars. What are stars made of ? • Stars are big balls of gas which gives off heat and light . In a galaxy there are hundreds and thousands of stars. • If I add all the galaxies stars up it would =160,ooo,ooo,ooo,oo oooo,ooo, Are stars gas or burning rocks? • Stars are made up of different types of gas and dust. One of the gases is Hydrogen and most of the star is Hydrogen. Why do stars shine ? • Stars shine because of the heat they make. The heat of a star reaches about 16million degrees Celsius. A grain of sand that hot could kill someone 150km away. Do stars burn ? • Stars do not burn but a galaxy contains clouds of dust and gas, as well as stars. It is in the clouds of dust stars are born. As more and more of the gas is pulled together by gravity into a cloud, the cloud starts to spin. The gas atoms start to bump into each other faster and faster. This creates heat energy, and then the cloud gets hotter and hotter. Thanks for watching www.starchild.com www.thinkquest .com www.allsands.com