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The earth is 4 6 billion years old if how long a year on other plas universe today e s sun facts about age al review all kill take sunlight to reach orbit and rotation science day now shorter than 24 new scientist pla through ages did scientists mars red information curious kids spinning exactly much has warmed days any form solved 5 really 23 hours 56 minutes worldatlas film final 2016 our home small mini50 records