Brian Greene on X: "The observable universe extends for about 92 billion light-years. No human has ventured farther from Earth than 1.29 light-seconds. https://t.co/l7fdzsQocl" / X
What Those Light Years Carry: Thomas, Aden: 9781945752971: Amazon.com: Books
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What is a light year, and how many Earth years are equivalent to a light year? - Quora
