Cut and GLUE https://www.youtube.com/watch?v=ueCXydnpMX4

Life cycle of an AVERAGE star Sketch it Stellar Nebula: gas and dust

The center of the nebula gets hotter as it shrinks, b/c of friction. Sketch it The center of the nebula gets hotter as it shrinks, b/c of friction. Nuclear fusion of H begins at 14 million degrees K.

“Middle Age” This is where stars spend most of their lives. The larger the mass, the SHORTER the life span.

The star expands up to 100 times its original size after its hydrogen is depleted At this point the star will collapse

At the end of the red giant stage, the star blows its outer layer of ionized gases off into space.

Eventually gravity crushes the matter in the star into a small planet-sized core of immense density that’s very bright.

Dead Star Eventually a white dwarf will cool down and form a black dwarf. A ball of gas which is not capable of nuclear fusion within its core.

The Fate of the Sun/Earth https://youtu.be/peNeE3qCMH8

Life cycle of a MASSIVE star:

Stellar Nebula: gas and dust (high mass stars are bigger)

The center of the nebula gets hotter as it shrinks, b/c of friction. Nuclear fusion of H begins at 14 million degrees K.

“Middle Age” This is where stars spend most of their lives.

Are born on the main sequence, but run out of Hydrogen faster Are born on the main sequence, but run out of Hydrogen faster. (MORE mass, MORE hydrogen, MORE energy.)

The violent death of a high mass star, occurring when nuclear fusion within the star can no longer produce the heat required for equilibrium. The star collapses and then EXPLODES!!!!

If the collapsed core of a supernova is 2X the size of sun, it shrinks to 20 km in size with the density of 1 tsp weighing 100 million metric tons!!!! Sketch it

If the collapsed core is 3X or more massive than the sun: An incredibly dense object whose gravity is so strong that not even visible light can escape from it forms. Black holes seem to warp space and time around them. Sketch it

Average Size Star Massive Star Red Super Giant Red Giant Stellar Nebula Neutron Star Supernova Planetary Nebula White Dwarf Black Hole

Our Sun: Is a low-mass star that will follow the red giant, white dwarf, black dwarf stages in approximately the next 5 billion years….we will NOT EXPLODE into a supernova!

Types of STARS

Planet/Star Comparison https://youtu.be/HEheh1BH34Q