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Old 05-02-2012, 10:58 AM
blood63 blood63 is offline
Join Date: Aug 2009
Posts: 415
A part of the universe is opaque. Why?

Why can we only see a part of the universe? As the opaque part covers moves further apart and occupies more volume, will it eventually become transparent?

Also, how fast is the universe expanding? Not at the speed of light, right? So the universe is older than the 13.7 billion years which is its size in light years.



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