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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

User JoeCamel
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2 Answers

3 votes

Light years is another one

User CanC
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8.5k points
2 votes

Billions of years, there isn’t anything else

User Lenise
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