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*a nebula is a large cloud of gas and dust that spread out in an immense volume ..
*gravity can pull some of the gas and dust in a nebula together
*protostar- earliest stage of a star life
*a star is born when the nebula contracts gas and dust and becomes so dense and hot that nuclear fusion starts
*a stars mass determines how long it will live
*a low mass main sequence star uses up it fuel slowly and eventually becomes a white dwarf small mass stars have much longer lifes
*our sun is a low mass star it will take billions of years to use up their nuclear fuel ..
*as start to run out of fuel their outer layers expand becoming a red giant
*eventually the outer parts grow larger and drift out into space forming a glowing cloud of gas called a planetary nebula
*the blue white core of the star left behind cools and becomes a white dwarf
high mass stars - high mass stars quickly envolve into brlliant super giants
*when a supergiant runs out of fuel it can explode suddenly into a supernova . the remains become either a neutron star or a black hole
*After a supergiant explodes some of the materials left from the star fcorm a neutron star
*a black hole is a object with gravity so strong that nothing can escape
*after a very massive star dies in a supernova explosion the gravity of this mass is so strong that the gas becomes dense and packs
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