ANSWER:-
THE UNIVERSE IS ABOUT13.7 BILLION YEARS OLD .AT ITS BEGINNING IT LOOKING NOTHING LIKE IT DOES TODAY .YET ,EVERYTHING IN TOTAY'S UNIVERSE DID EXIST IN SOME FORM BACK THEN .IT ALL STARTED WITH THE BIG BANG ,A KIND OF EXPLOSION THAT WOULD NOT ONLY GO ON TO PRODUCE ALL THE MATTER IN THE UNIVERSE BUT ALSO MARKED THE START OF TIME.
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