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The life cycle of stars from birth to death
Stellar Evolution The life cycle of stars from birth to death
Nebula condense by accretion
Event (shock wave, super nova, etc) triggers nebula collapse
->fusion -> a star
Gas & dust attracts due to gravity Contracting matter causes a
spinning & flattening Large clump in center = forming star Flat
accretion disc = planets When fusion begins, stellar wind pushes
out un-clumped matter and gravitational collapse stops nebula
Protostar and disc Gravity & heat ->fusion -> a star
Protostar =forming star; not yet fusing
glows frompressure/frictiontemperatures (not shining) Thermonuclear
Fusion Enough heat & gravity = atoms smashed into each other
Universe~80% Hydrogen (H) + 20% Helium (He) + Dust H + HHe + light
& heat(Star shines!) Neutrinonearly massless particle with no
charge Positron- opposite of an electron; positively charged. Brown
Dwarf? = a failed star; never started fusion
Not enough mass innebula to createenough gravity,pressure
andtemperature to startfusion