-Approximately 15 billion years ago, the universe began with a 'big bang'-It is assumed that all the material in the universe started as a super massive ball of Hydrogen Gas-Ball of gas exploded and expanded-> all of this material eventually condensed into galaxies of dust and gass-expansion continues today

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1.
-Approximately 15 billion years ago, the universe began with a 'big bang'
-It is assumed that all the material in the universe started as a super massive ball of Hydrogen Gas
-Ball of gas exploded and expanded-> all of this material eventually condensed into galaxies of dust and gass
-expansion continues today