Life Cycle of a Star Nebula Baby star

Life Cycle of a Star

Nebula • Baby star • Composed of gas and dust

Protostar • Center of nebula begins to shrink as it gets hotter • Nuclear fusion begins

Main Sequence • “Middle Age” • Star will spend most of its life in this stage

Red Giant • Star starts to die • It expands 1, 000 times its original size • No more nuclear fusion (no more hydrogen) Fun Fact: Our Sun will expand 400 x its current size

Planetary Nebula • Star blows off its outer layer of ionized gases off into space

White Dwarf • Gravity crushes the matter into small planet-sized body of immense density • VERY BRIGHT

Black Dwarf • Dead Star • Ball of gas not capable of nuclear fusion within its core **Theoretical: The universe is not old enough for the first white dwarf to have burned out **

Draw the Bohr models for: • Helium • Carbon • Sulfur

Nebula • Baby star • Composed of gas and dust

Protostar • Center of nebula begins to shrink as it gets hotter • Nuclear fusion begins

Main Sequence • “Middle Age” • Star will spend most of its life in this stage

Red Supergiant • MORE mass = MORE hydrogen = MORE energy • Run out of Hydrogen faster (larger)

Supernova • Violent death of high mass star • Occur when nuclear fusion can no longer produce heat required for equilibrium • Star collapses and then EXPLODES

Neutron Star • Very dense • Collapsed core of supernova is 2 x the size of the sun • Shrinks to 20 km in size with the density of 1 tsp weighing 100 million metric tons

Black Hole • Collapsed supernova core is 3 x more massive than the sun • Incredibly dense object • Gravity is so strong that not even visible light can escape from it

Remember…. • Our sun will not explode! It is not a massive star

Draw and Copy

https: //www. youtube. com/watch? v=PM 9 CQ Dl. QI 0 A