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Artifact: Life Cycle of the Stars

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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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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.

  • 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.

  • 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.
  • 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.
  • 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!!!!!!!

more websites
More Websites

other resources
Other resources
  • Mr. Wildeboar’s slide show’s
  • Our notes