"Bill Wright" wrote in message
I'm hopeless at maths, but I'm trying to get something across to an
intelligent child. So, if the distance from here to London (250km) is
represented by the thickness of a hair (0.2mm) how far is a light year?
It doesn't have to be a hair; it could be anything familiar and small.
It's 2.5 million light years to the Andromeda Galaxy; that's what we're
If 250km = a hair of 0.2 mm in width, my rough calculation suggests that a
light year would be represented by something with a width of about 53,000