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Stars and Galaxies QUIZ PREP •What force caused the atoms from the big bang to form into galaxies and stars ? GRAVITY! What type of galaxy is the Milky Way? SPIRAL GALAXY •What causes the pressure in a star that causes it to begin its burning reaction? GRAVITY! What is the last stage a yellow star goes through as it dies? It becomes a red giant What did the Big Bang produce in the way of elements? •HELIUM AND HYDROGEN What do elliptical galaxies look like? A fuzzy ball • The temperature of a star can be determined by it’s color. What is the correct order of star colors from the coolest to the hottest? •RED •YELLOW •WHITE •BLUE •How does a blue or white star die? •They explode •Which type of galaxies spin? •Only spiral galaxies spin. •What is the smallest type of galaxy? •Irregular galaxies are the smallest What am I? •Spiral Galaxy What am I? •Elliptical Galaxy What am I? •Barred Spiral Galaxy What am I? •Irregular galaxy •How do we know the universe is expanding? •red shift •What is a nebula made of?. •Dust and gas from an exploded star. •The stars in an irregular galaxy are mostly ____? •YOUNG STARS •How do we know the distance to a star? •Parallax •What is the type of star that lives the longest? •Red Dwarf •What is the type of star that lives the shortest? •Blue star •What type of star is our sun? •YELLOW •What type of star has the most gravity? •BLUE STAR •What type of star has the least gravity? •Red Dwarf •Why does Earth have to be on an outer arm of the Milky Way for us to live here? •Too much radiation from crowded stars closer to the center. •What is a light year? •The distance light travels in 1 year •If the universe stopped expanding today, would we be able to know that right away? •Nope, it would take billions of years for the light from them to get to us.