Ok, here goes nothing. If the universe was created in a big bang, and is therefore expanding, and when we look out into space we are looking back in time, how come everything far away is so far apart? Put it another way, say the Universe is 20 billion years old, and we can look back 10 billion years, if we look in opposite directions, things look 10 billion years 'away', in each direction. Yet these two parts of the sky are 20 billion years away from each other, when 20 billion years ago, they should have been in the same place. Am I making any sense? (Ignore the numbers, 20 billion years is probably wrong, but it helps with the maths!)
