There is the same relative distance, in comparison with actual size, between the atomic nucleus and the inner electronic circuit as exists between the inner planet, Mercury, and your sun. [1]
If the mass of an electron were 2.8 grams, the volume of that electron would be as large as that of the Earth. If the volume of a proton were like the head of a pin, the head of a pin would have a diameter equal to that of the Earth's orbit around the Sun. [2]
Stars have just as much comparative elbow room in space as one dozen oranges would have if they were circulating about throughout the interior of Urantia, and were the planet a hollow globe. [3] Some of the reddish have acquired a density at their center that one cubic inch of such a star, if on Urantia, would weigh six thousand pounds. [4]