The big bang theory, Stars are born and later they die, Galaxies are divided 3 different types, Staellite - something that moves around or orbits a planet, Our galaxy is called " The Milky Way ", 14 billón years ago, Starts of an expansion, Where did the sun come from?, Sunspots appear dark because it´s cooler, It´s not solid, Center of the solar system, Light and heat, Sunspots - dark spots on the sun, Huge ball of gases, Medium- sized star

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