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Thanks Rob. I remember reading about the triangles but another question I' sure I will get from students as well as from myself.
I can see frowards and backwards, right and left and up and down but what does a flat or open or closed universe look like. Does flat mean the universe is like all the galaxies etc on a 2 dimentional plane but that would seem to contradict my visual observations. A girl in my class the other day said this stuff just does my head in in a good way and me too.
Mark
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