Notes

​𝙻𝚒𝚟𝚎𝚜 𝚘𝚏 𝚜𝚝𝚊𝚛𝚜

Nebula
•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.
*
Nebular Theory
•The sun and planets formed from a rotating disk of dust and gasses.
•As the speed of rotation increased, the center of the disk began to
flatten out.
•Matter became more concentrated in this center, where the sun
eventually formed
*
Protostar
•A cloud of dust a gas forms a protostar, the earliest stage of life for a
star
•A star is born when the nebula contracts gas and dust and becomes so
dense and hot that nucle
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Life span
•The mass determines how long it will live
•A low-mass, main sequence star uses up its fuel slowly and eventually
turns into a white dwarf. Low-mass stars have longer lives
*

​̳𝙻​̳𝚘​̳𝚠​̳-​̳𝚖​̳𝚊​̳𝚜​̳𝚜​̳ ​̳𝚂​̳𝚝​̳𝚊​̳𝚛​̳𝚜​̳
<A low-mass star like our sun take billions of years to use up its nuclear fuel>
Red Giant
•As they start to run out of fuel and the outer layers expand to create a
red giant.
*
-Planetary Nebula
•Eventually, the outer parts grow larger and drift out into space, forming
a glowing cloud of gas called a planetary nebula
*
-White dwarf
•The blue-white core of the star has cooled and become a white dwarf


​̳𝙷​̳𝚒​̳𝚐​̳𝚑​̳ ​̳𝚖​̳𝚊​̳𝚜​̳𝚜​̳ ​̳𝚜​̳𝚝​̳𝚊​̳𝚛​̳𝚜​̳
<High-mass stars quickly evolve into brilliant supergiants>
-Supergiant
•When a supergiant runs out of fuel it explodes into a supernova, that
can either become a neutron star or a black hole.
-Neutron star
•after a supergiant explodes, some of the materials left form a neutron
star
•Neutron stars are the remains of high-mass stars
•They are smaller and denser than white dwarfs
-Black hole
•A black hole is so strong not even light can escape
•The gravity of this mass is so strong that the gas becomes dense and
packs.