Tobin Dax:
What do cosmologists use for the "measuring stick" of the size of the universe at any given time? (In other words, what is the size of the universe 5 billion years ago or 7 billion years from now compared to if we want to describe it?) Hopefully that makes sense.
Is it a light year? I remember in Maths that to find the age of the universe, they use the hubble and see how far it can see. And because you need light to travel and hit the teloscope to see. You can tell how old/big the universe is.
At least i think so....... If that made any sence.
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