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    I What is the size of the observable universe relative to CMBR

    Reading the Wikipedia article makes my head spin! Somehow the figure doesn't seem quite right. I don't understand how the CMBR doesn't define the edge of the universe. If we can see the CMBR that happened near...
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    B What is "space"?

    Hi. This may seem a straightforward question, but I'm not sure given some of the threads about expansion, infinite universes, and multiverses. How about I make a statement, and you folks shoot it down? Space is nothing. It is the absence of all particles and energy. It is infinite and timeless...
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    B Spooky action communication

    If entangled pairs can be used to communicate instantaneously, does that mean one of the paired particles has to be physically delivered to the reception point in order to establish communication?