Instructions 1.Print onto A3 2.Use with mid  high ability pupils 3.Best used to summarise information which has been extracted from text books or the internet 4.Could also be used for revision

BIRTH DEATH PLANETARY NEBULA WHITE DWARF NEUTRON STAR BLACK HOLE What is it made from? Bigger mass star “Massive Star” What role does gravity play in the birth of the star? Smaller mass star “Average Star” e.g.Sun What elements are being made? What has happened to the temperature and size? Is there any fusion? What happens to the star? Why has fusion continued, when does it stop? Why does the star now begin to die? RED GIANT What elements are being made? Mass of the core 1.4-4x The Sun THE LIFE CYCLE OF STARS Why does a star leave the main sequence? Mass of the core 4x The Sun SUPERNOVA What elements are made? RED SUPERGIANT What has started? PROTOSTAR Main Sequence The elements are spread across space leaving a core

BIRTH DEATH PROTOSTAR PLANETARY NEBULA WHITE DWARF SUPERNOVA NEUTRON STAR BLACK HOLE MAIN SEQUENCE What is it made from? Protostars are made from clouds of Hydrogen and Helium gas What has begun? Bigger mass star “Massive Star” RED SUPERGIANT What role does gravity play in the birth of the star? Gravity causes the star to attract more gas and dust until the core becomes hot and dense enough for fusion to begin Smaller mass star “Average Star” e.g.Sun What elements are being made? In Red Giants and Red Supergiants Helium fuses into Beryllium, and Carbon, which makes heavier elements such as Nitrogen and Oxygen Why does a star leave this sequence? When the star runs out of Hydrogen it leaves the main sequence stage Nuclear fusion has started fusing hydrogen into helium What has happened to the temperature and size? The star has cooled and shrunk In a White Dwarf there is no fusion so the star cools and fades What elements are being made? These have enough mass for fusion to continue after the Helium runs out. When most of the core has become iron the star explodes in a… Why does the star now begin to die? When all the Helium has run out the star lacks enough mass to continue fusion, the outer layers are ejected in a shell of material called a… RED GIANT What elements are being made? Heavy elements e.g. Gold, Uranium and Lead Mass of the core 4x The Sun The elements are spread across space leaving a core Mass of the core x The Sun THE LIFE CYCLE OF STARS