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What units are used when describing the length of time that the universe has been expanding? (could possibly be multiple) billions of years millions of years light years light year kilometers decades
answered
Dec 25, 2017
Physics
middle-school
6
votes
49.1k
views
What the value of 9 in 69,143
answered
Aug 6, 2017
Mathematics
middle-school
5
votes
201k
views
What is a physical form in which a substance can exist?
answered
Sep 17, 2016
Physics
middle-school
4
votes
151k
views
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