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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
. According to the nebular theory the sun and planets formed from a rotating disk of dust and gases
. 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
. The cloud pulled together forms a protostar, which is the earliest stage of a star's life
. A star is born when the nebula contracts gas and dust and becomes so dense and hot that nuclear fusion starts
The Life Span Of A Star
. A star's mass determines how long it will live
. A low- mass main-sequence star uses up it's fuel slowly and eventually becomes a white dwarf. Small-mass stars have much longer lives
Low-Mass Star Cycle
. A low-mass star like the sun takes billions of years to use up their nuclear fuel
Red Giant
. As they start to run out of fuel, their outer layers expand becoming red giants
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 left behind cools and becomes a white dwarf
High-Mass Stars
. High-Mass stars quickly evolve into brilliant super giants
Super Giant
. 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
Neutron Stars
. After a supergiant explodes, some of the materials left from the star 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 an object with gravity so strong that nothing, not even light 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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