Ok, relevancy!
Suppose a hydrogen atom were a football. That gives it a diameter of say, 10 cm, versus 1 Angstrom, or 1 billion times as large on a linear scale. Then .3 atoms per cc translates to .3 footballs per cubic 10^9 centimeters, or cubic 10^4 km. So that’s 71000 footballs within the sphere with radius equal to the earth-moon distance, by my calculation.
Well hey, that’s a lot of footballs!