An example of an everyday comparison to help understand the scale of the universe,
"If in your mind's eye you take the average galaxy to be about the size of a bee – a small bee, a honey-bee, not a bumble-bee – our galaxy would be roughly represented in shape and size by the half-crown, and the average spacing of the galaxies would be about two yards, and the range of telescopic vision about a mile."
Fred Hoyle (1960) The Nature of the Universe (Revised ed.)
Read about quotidian comparisons
The half-crown was a British coin worth £0.125 in pre-decimal currency (a crown was five shillings, when there were twenty shillings in a pound), very roughly the size of a 10p piece. (A yard is approximately a metre in length, and a mile is a little more than 1600 m.) Remember to use a honey-bee, not a bumble-bee, in this comparison.
