Stars Extension Project- ExtraCredit By: Liling Class: L
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.
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.
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
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.
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).