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Introduction

Stars are all different, wondrous things, which all go 

through different life cycles. This book will outline the life 

cycles of three types of stars; catagorised into

Small Stars - nebulae, protostar, main sequence, white 

dwarf

Average Stars - nebulae, protostar, main sequence, red 

giant, planetary nebulae, white dwarf

Large Stars - nebulae, protostar, main sequence, super 

giant, supernova, blackhole/neutron star

Bright Beginnings

All stars begin from clouds of dust called 

nebulae. This birthplace of stars is made 

of hydrogen gas and dust

Protostars 

The nebula forms a ball of gas and dust 

pulled together by gravity. As the gas 

cloud gets denser, nuclear fusion occurs 

- which creates the energy found in 

stars.     

Main Sequence Stars

The middle and longest stage a star is in. Our sun is 

in this stage. This is the stage where the sun is still 

effectively burning fuel. All stars go through this 

stage. 

Red Giants

The stage after main sequence for medium stars 

(small stars skip this step) Large stars occurring 

when the main fuel source of a star begins to run 

out in a medium sized star causing the star to 

expand

Super Giants

The stage after main sequence for Large Stars 

when they begin to run out of fuel. This causes it to 

expand (similar to red giants)

Supernova

This is the large explosion that occurs when a large 

star runs out of fuel and needs to release energy. 

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