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7 March, 20:03

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

+5
Answers (2)
  1. 7 March, 20:18
    0
    Light years is another one
  2. 7 March, 22:23
    0
    Billions of years, there isn't anything else
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