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The study of the large-scale structure, history, and future of the universe. Cosmology is about asking and answering questions about the "big picture" - the extent, origin, and fate of everything we know.
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If a CMB photon traveled for 13.7 billion years to reach me, how far away was the source of ...
If a CMB photon traveled for 13.7 billion years (- 374,000 years) to reach me.
How far away was the source of that CMB photon when it first emitted it?
My attempt to solve this question was to use the …