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24 September, 12:47

What units are used when describing the length of time that the universe has been expanding? [CHECK ALL THAT APPLY] [A is not the only answer]

billions of years

millions of years

light years

light year kilometers

decades

+1
Answers (2)
  1. 24 September, 15:37
    0
    Billions of years, there isn't anything else
  2. 24 September, 15:50
    0
    Light years is another one
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