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  1. Question about light-years

    Started by xcasper, August 26th, 2017 12:43 PM
    astronomy, distance, light years, space, speed
    • Replies: 9
    • Views: 522
    Last Post: August 31st, 2017 11:30 AM
    by exchemist  Go to last post
  2. how can we know the age?

    Started by thestotle, February 25th, 2014 02:05 AM
    age, expanding, light years, universe
    • Replies: 5
    • Views: 267
    Last Post: February 26th, 2014 03:23 AM
    by GoldenRatio  Go to last post
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