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Stars
Formation
Works Cited
- Stars form inside relatively dense concentration of a interstellar gas/dust known as molecular clouds.
- Star formation begins when the denser parts of the cloud core collapse under their own weight.
- Stars are born within clouds containing dust & are scattered throughout most galaxies.
- There are regions that are extremely cold, which causes gases to become molecules making the atoms bind together.
- CO & H2 are most common molecules in interstellar gas clouds.
- The cold causes the gas to clump to the high densities.
- Which a certain point is reached, stars are formed
- http://science.nasa.gov/astrophysics/focus-areas/how-do-stars-form-and-evolve/
- http://abyss.uoregon.edu/~js/ast122/lectures/lec13.html
- http://imagine.gsfc.nasa.gov/docs/teachers/lifecycles/starchild5.pdf
- http://news.nationalgeographic.com/news/2007/02/070214-star-death.html
- http://i.space.com/images/i/000/004/210/i02/080603-iod-supernova-02.jpg?1292268585
- http://www.telescope.org/pparc/res8.html
Life of Stars
Classification
- 1st Stars start out as Nebula, a cloud of gas (hydrogen) and dust in space.
- Dark Nebula's are dense clouds of hydrogen which almost absorb all the light from stars behind them.
- 2nd the Red Giant it is formed during the later stages of the evolution of a star like the Sun.
- 3rd the Red Dwarf a very cool, faint and small stars, about one tenth the mass and diameter of the Sun.
- 4rd the White Dwarf a very small, hot star, the last stage in the life cycle of a star.
- White dwarfs are shrunken remains of normal stars, when the nuclear energy have been used up.
- O- dark blue 28,000 - 50,000k luminosity 1,400,000 abundance 0.00001%
- B- blue 10,000- 28,000k luminosity 20,00 abundance 0.05%
- A- light blue 7,500- 10,00k luminosity 80 abundance 0.3%
- F white 6,000- 7,500k luminosity 6 Abundance 1.5%
- G- yellow 5,000- 6,000k luminosity 1.2 abundance 4%
- k- orange 3,500-5,000k luminosity 0.4 abundance 9%
- M- red 2,500-3,500k luminosity 0.04 (Very faint) abundance 80%
Death of a Star
Supernova
- Dies after several billion years
- Bigger stars = shorter life
- Smaller stars = longer life
- when they die, they create a beautiful explosion of several colors
- these colors are actually composed of gases, rocks, and asteroids.
- the death of a star is very similar to an atom and how they explode as well
- their death is also known as a supernova
- a supernova then leads to the formation of a black hole
star's death photo:
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