Lifecyle Of Stars Flashcards
What is the lifecycle of stars like the sun?
1.Nebula
2.Protostar
3.Main sequence star(our sun)
4.Red giant
5.Star throws off clouds of dust and gas
6.White dwarf
Lifecycle of big stars (unlike our sun)
1.nebula
2.protostar
3.massive main sequence star
4.red supergiant
5.supernova
6.neutron star
What force pulls the gases together in a star
Gravity
What reaction occurs to produce energy inside a star
Nuclear fusion
What is a nebula
A nebula is a cloud of gas and dust (mainly hydrogen)
What is the fuel that the sun uses
The sun is fueled by nuclear fusion which forms hydrogen into helium.
Stars that have more mass than ours are what?
Much hotter and brighter
Describe 2 ways how gravity has a part in the lifecycle of a star
Gravity pulls clouds of dust and gas together to create a protostar
Gravity makes the core of the star collapse
Why won’t our sun form a black hole
Stars like our sun aren’t big enough to cause a black hole
How is a nebula formed?
A nebula is a formed when large clouds of gas and dust are together
How is a protostar formed ?
The gas and dust begin to collapse from gravity and temperature and pressure increases making a core in the middle of the gas called a protostar
How is a main sequence star formed from a protostar
A protostar forms a main sequence star when it accumulates enough mass and heat enough to causes nuclear fusion. When nuclear fusion begins to turn hydrogen trans into helium it becomes a main sequence star
How is a red giant formed
A red giant is formed when a main sequence star (like the sun) runs out of hydrogen as fuel in the core for nuclear fusion , this causes the star to start fusing hydrogen .making the sun hotter and redder
What causes a red giant to shed its outer layers -
A red giant starts dying as its used up all of its helium in its core and can no longer sustain nuclear fusion. This causes the star to emmit waves of clouds and dust as it sheds its outer layers
What causes the main sequence star to become a white dwarf
When the star burns through its supply of helium . It then shrinks from red giant to become. White dwarf . In a white dwarf the fusion has now stopped
