Notes

Stars are like living things they are born go through its life cycle and die
A nebula is a large cloud of gas and dust that spread out in immense volume
Gravity can pull some of the gas and dust in the nebula together
The planets and the sun formed from a rotating disk of dust and gases
As the speed of the rotation increased the center of the disk began to flatten out
Protostar the cloud pulled together forms a protostar which is the earliest stage of a stars life
A star life span is determined by mass Small mass stars have a much longer life
A low mass star like the sun it takes billions of years to use its nuclear fuel
As they start to run out of fuel their outer layers expand become red giants
Eventually the outer parts grow larger and drift into outer space forming a glowing cloud of gas called a planetary nebula
The blue white core of the star left behind cools and becomes a white dwarf
High mass stars quickly evolve into brilliant supergiants
When a supergiant runs out of fuel it can explode into a supernova
After a supergiant explodes some of the materials left from the star form a neutron star neutron stars are the remains of supergiant
A black hole is an object with gravity so strong that nothing not even light can escape