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Stars - Liling
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Stars - Liling

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Transcript

  • 1. Stars Extension Project- ExtraCredit By: Liling Class: L
  • 2. Star and Categories What is a star? A star is a collection of duct and gas in ballform that is gathered together by gravity. What are the characteristics? The characteristics are stars aretemperatures, luminosity, types of stars and spectral classand sizes which we can use to classified the stars.
  • 3. CharacteristicsTemperature: how hot is it.Luminosity: how bright is it.Types of stars: Main Sequence, Giant, Supergiant, DwarfSpectral class: O,B,A,F,G,K,M (from hottest to coldest)Sizes: how large is it.
  • 4. Types of stars Main Sequence: A major grouping of stars that transfer hydrogen intoenergy, it has longest period in a stars lifetime. Dwarf: A star has low mass, small size and average or below luminosity. Giant: bigger than main sequence and hotter than main sequence but withthe same surface temperature. Supergiant: most massive (big) and brightest stars
  • 5. H-R Diagram & Nuclear FusionH-R Diagram is a graph that classified the stars according to sizes, types ofstars, temperature, color and luminosity.Nuclear Fusion is a process that transfer 2 hydrogen molecules into 1 heliummolecule, it creates energy.
  • 6. Life of a star
  • 7.  Stellar Nebula- a collection of dust and gas that it gathered together bygravity. Then collection of gas and dust get closer and closer formed either massivestar or average star. AS it gets closer the surface gets colder that formed either red giant or redsupergiant. Red giant explodes and becomes Planetary Nebula/ Red Supergiantexplodes and becomes supernova. Planetary Nebula becomes White Dwarf when it gets smaller and lose itlight. It becomes Black Dwarf that it’s dead. Supernova becomes either Neutron star (the star that spin) or black hole (itstuck everything in and everything inside is disappeared).