If the Milky Way were the size of a coffee cup, how big would the rest of the universe be?

The Milky Way has a radius of about 50,000 light years. the visible universe has a radius of about 15 billion light years or 300,000 time the size of the Milky Way. So for a 8 centimeter wide coffee cup as the Milky Way, the VISIBLE universe would be a sphere about 48 kilometers in radius...give or take.