2 ms·

Not really empty. They float in magnetic field.

• ineedasername 5y ago
  In that sense of the word nothing could be said to be truly empty as there are always "fields" of some sort. At minimum there is always a gravitational field. If we are going to use the word "empty" at all, then we are implicitly setting boundaries on the sense of the word to, usually, exclude the four fundamental forces.