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Melyssa Serpas

on 28 April 2014

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Transcript of NEBULA

What elements are present?
90% hydrogen
10% helium
0.1% heavy elements like carbon, nitrogen, magresium, potassium, iron
Why would the nebula begin to contract/shrink?
*because of gravity
As the matter collapses, what does the nebula look like and what does it do?
It spins like a disk, the bright spot in the middle of it eventually becomes a protostar
Describe the protostar
How long does this stage last?
how hot must a protostar get in order to become a star?
Why does the protostar heat up?
How long does this stage last?
How long does this stage last?
How is th energy generated?
which elements are being used up?What type of fusion?
Why is this stage stable?
Main Sequence star
how long does this stage last?
Why do main sequence stars become giants?
What type of fusion (which elements?)
Why is this star expanding?
How long does this stage last?
What is a planetary nebula?
Why is there no fusion?
How long does this stage last?
Why is there no fusion? What elements exist?
What happens to the giant star as it becomes a white dwarf?
It is still glowing. Why?
How long does this stage last?
Review what happens to a super giant that would make its life come to an end.
Which elements are fusing?
Why does the age end? What happens?
How long does this stage last?
Explain what it is and it is made of
Give an example of how dense it is
Why is there no fusion?
how long does this stage last?
Explain what a black hole & a neutron star?
What do they give off?
where do black holes usually exist?
15,000 years, depends on each nebula
100,000 years
It looks like a star but its core is not hot enough for fusion to take place
*loose gas falls into its center
*the infalling gas release kinetic energy in the form of heat and the temperature and pressure in the center of the protostar goes up
To become a main sequence star 10 million k
about 10 billion years
energy in the form of gamma-rays, is generated solely in the nuclear burning core, Energy is transferred towards the surface either in a radiative manner or converection depending on which is more efficient at the temperature, densities and opacities
a main sequence star tends to stay stable due to the hydrostatic equilibrium that exists at each point within the star
Why does this stage end & what happens?
Main sequence stars are converting hydrogen into helium by nuclear fusion
The fusion is releasing more energy during helium burning than at the main sequence stage, so the star is bigger, but less stable
Why does this stage end & what happens?
Where does the energy for fusion come form?
How is a black dwarf different and why are there probably no black dwarfs in the universe?
What produces the energy necessary for fusion of heavier elements to occur?
What is the difference between a black hole & neutron star?
10-50 million years
the helium starts to fuse and then the outer layer starts to expand outward
Nuclear fusion/ helium
high temperature in the core
Higher temperature = higher pressure
This stage end because it has burnt out its helium
10 to 1000's of years
Astronomical objects consisting of a glowing shell of gas and plasma formed by certain types of stars
Carbon ash keeps it from fusing to make helium
longer than universe age
Not enough heat, Carbon, Oxygen
Nothing really happens......it just cools down
Still has residual heat
It is different because it comes fro white dwarfs and it's dead.
100 seconds
The super giant has enough energy to fuse carbon into iron but making it take away energy instead of giving it the energy it needs and gravity wins, and it collapses then....
BOOM .........
other than iron plutonium and uranium
Stellar Evolution
The super giant collapse on its own weight ans creates a flash from shock, then shock hits the surface letting the star blow apart , Lastly it creates a fireball bigger then the sun and afterward it leaves behind and interstellar gas
billions of years or when ever it runs out of radiating heat
Neutron star are compact objects that are created in the cores of massive star during super nova explosions. They are made out of neutrons( like the name)
Its so dense a tea spoon is over a billion tons
Because they are stable with neutrons and don't need to be used
its infinite
a region of space that has a gravitational field so strong that no matter or radiation can escape
When you are pulled into a neutron star you burn up or get smashed by the heat or gravity
gravitational waves
in the middle of galaxies
A black hole you go away ............
FOREVER and EVER!!!!!!!
Sites used
Created By: Alyssa
Period: 4
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