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Download Notes: 3.5 STAR EVOLUTION Name: ______ Star
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Unit 3.5 Star Evolution Notes: 3.5 STAR EVOLUTION Name: ________ Part 3: Re-read the Part 1: Fill in the blanks during the class discussion. highlighted Star Evolution Background information in your Ø “Evolve” or “Evolution” means to CHANGE. notes. Construct Ø All stars change into different STAGES or phases throughout their quiz questions life. using this Ø What a star ends as depends on its MASS. information. Write Ø A low mass star will evolve DIFFERENTLY than a high mass star. the questions next to the paragraph where the answers can be found. Stages of Star Evolution 1. Nebula: The BIRTH of a star. Ø A nebula is CLOUD of dust and gas that is not a star yet. Ø HYDROGEN is most common gases in a nebula. Ø A nebula is also called a “Stellar NURSERY”. Nebula (the cloud) Protostars (bright spots) 2. Protostar: The material in a nebula CONDENSES and the star starts to come together. Ø CONDENSE means the gases that will form the star begin to collect in the middle. Ø The bright spots in Nebulas are PROTOSTARS will eventually become STARS. 3. Main Sequence star: Ø This is the stage where the star “ SWITCHES ON”. Ø The gravity in the core of the star is enough that FUSION begins. Ø Fusion powers the star and turns the HYDROGEN gas into HELIUM. Ø The equation for fusion is: H1 + H1= He2 + ENERGY. 4. Giant/SuperGiant Star: Ø Happens when the star runs out of HYDROGEN FUEL. Ø The star INCREASES in size Ø Small to average size stars become GIANT stars Ø Large Mass stars become SUPERGIANT. 5. Star Destruction-Planetary Nebula OR Supernova Once the star runs out of fuel for good it will be destroyed. Ø A PLANETARY NEBULA is when a Giant star begins to fall apart and the outer layer of gas float out into space. Ø A supernova is big EXPLOSION that happens when a Supergiant runs out of fuel 6. End of Stars Life. (White Dwarf, Neutron Star, or Black Hole Depending on its MASS a star will end its life as one of three things. Ø White Dwarf: what SMALL or AVERAGE stars end as. • White Dwarf stars are SMALL, and DIM, but hot. Ø Neutron Stars. what MEDIUM LARGE stars end as. • Neutron stars emit RADIO WAVES instead of light. Ø Black Holes: what the VERY LARGEST stars end as. • Black holes have so much GRAVITY that LIGHT cannot escape. • Black holes may be located in the center of THE GALAXIES and may even hold the galaxies together. • We could never travel to a black hole because of the distance, but if we could it IS possible it may be a path to another UNIVERSE. The Life Cycle of our Sun Ø The sun is currently 4.6 BY old. Ø At 10 BY of age, our sun will become a RED GIANT. Ø Our sun will end its life as a WHITE DWARF after 13 BY. Part 2. Re-read your notes. Highlight the most important information