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By Zachary and Alba. Artifact: Life Cycle of the Stars. Slides 3 through 12 is the life of a small to medium star. This is a picture of a red giant star. Nebula: The first step in a stars life. Nebula is a big cloud of gas & dust where stars form.

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By zachary and alba

By Zachary and Alba

Artifact: Life Cycle of the Stars


Artifact life cycle of the stars

Slides 3 through 12 is the life of a small to medium star.

This is a picture of a red giant star.


Nebula the first step in a stars life
Nebula: The first step in a stars life.

  • Nebula is a big cloud of gas & dust where stars form.

  • A nebula is considered the birthplace for stars.

This is a picture of the horse head nebula.



Protostar
Protostar

  • A protostar is a gaseous cloud of dust, gas and atoms.

  • Protostars either devolop into a Main Sequence star or a Small Protostar.

This is a picture of the pillars of gas in the eagle nebula.


Small protostars
Small Protostars

  • A small protostar is a brown dwarf star.

  • This star is to small to create enough heat to start fusion.

  • Since it can’t start fusion it doesn’t shine brightly, so brown dwarf stars are very hard to see in the night sky.

These are pictures of a brown dwarf right next to another bigger star.


Main sequence
Main Sequence

  • In a main sequence star the protostar gains enough mass to begin fusion.

  • The protostar could gain mass from clouds it goes through and other smaller protostars.

  • All Main Sequence stars fuse hydrogen.

  • A main sequence star will be a red giant when the Main Sequence runs out of hydrogen.


Hydrogen fusion
Hydrogen fusion

  • Hydrogen fusion is when 4 hydrogen nuclei come together to make helium nuclei.

  • The fusion cycle releases energy inside the core of the sun.

  • This fusion cycle generates the energy for our sun in our universe.


Red giant
Red Giant

  • A Red Giant is a Main sequence star that has ran out of hydrogen and begins to fuse helium. When this runs out of fuel, it will turn into a Planetary Nebula.

This is a picture of a red giant star.


Helium fusion
Helium fusion

  • A kind of nuclear fusion.

  • Helium fusion is also known as the tri-alpha process.


Planetary nebula
Planetary Nebula

  • A Planetary Nebula is a red giant that completely stops fusing.

  • Since the star isn’t producing a pressure outward, the outer layers of the star are driven away.

  • A Planetary Nebula will turn into a White Dwarf.


White dwarf
White Dwarf

  • A White Dwarf star is a left over core from a star

  • A White Dwarf may only be the size of the Earth, but it has the mass of half of the sun.

  • Our sun will become a white dwarf after it runs out of fuel.

  • White dwarf stars are one of the densest forms of matter.



Black dwarf
Black Dwarf

  • A Black Dwarf is a White Dwarf that cools off over trillions of years until it no longer emits light.

  • There are no know Black Dwarf stars in the galaxy. Even if there were any we would not be able to see them because they are black.

This is a picture of a black dwarf against a star filled back round.



Nebula
Nebula

  • A nebula for a big star is the exact same as for small to medium stars.

  • A nebula is a massive cloud of dust and different gasses.


Protostar1
Protostar

  • A protostar for a massive star is the same as a small to medium star.

  • A protostar is a small star that will turn into a massive main sequence star.

This Is a picture of a protostar in the Eagle Nebula.


Massive main sequence star
Massive main sequence star

  • Massive Main Sequence stars fuse hydrogen much faster than small or medium stars.

  • Since it fuses faster it runs out fuel so fast that it will turn into a Red Supergiant very quickly.

This is a picture of a massive main sequence stars layers.


Red supergaint
Red Supergaint

  • Massive main sequence star that runs out of hydrogen and begins fusing helium, then carbon, then oxygen etc.

  • A Red Supergiant star will turn into a Supernova when it runs out of elements that it can fuse.

  • A Red Supergiant will only live in this phase for a hundred thousand to a million years. This may semm like a long time to us, but it is no time at all in a stars life.


Supernova
Supernova

  • Fusion stops in the star.Since the star isn’t fusing, gravity takes over and the star collapses.

  • When the star collapses, there is a gigantic exlposion that rocks the universe.

This is a picture of 2 red supergiant stars colliding and producing a very big supernova.


Neutron star
Neutron Star

  • A neutron Star has a super dense core of a star that was left over after the explosion of a supernova.

  • A neutron star is only 10 to 15 miles in diameter; but have the mass of 1.5-2 times that of the Sun.

This is a picture of a neutron.



Black hole
Black hole

  • Stars that have masses of 25 to 50 times that of the sun form black holes after a supernova.

  • The left over core of the star is so dense that is causes gravity to collapse.

This is a picture of a black hole.


Websites used
Websites Used!!!!!!!

  • http://www.historyoftheuniverse.com

  • http://filter.case.edu/sjr16/advanced/stars_nebula.html

  • http://en.wikipedia.org/wiki/helix_nebula

  • http://www.windows.ecar.edu

    http://www.daviddarling.info/encyclopedia/B/blackdwarf.html


More websites
More Websites

  • www.astrophysicsspectator.com/.../stars/MainSequence.html

  • en.wikipedia.org/wiki/Main_sequence

    http://www.sciencedaily.com/articles/r/red_supergiant.htm

    http://aspire.cosmicray.org/labs/star_life/starlife_proto.html

    http://en.wikipedia.org/wiki/Brown_dwarf


Other resources
Other resources

  • Mr. Wildeboar’s slide show’s

  • Our notes