They are unaccountable.

Some are worlds inhabited like ours; others were so, and revolve solitary in space, waiting for a fresh evolution of life; many are still forming; and yet all these worlds are no more than corpuscles of the luminous mist of the infinite.

Space is peopled by fires that have burnt for millions, trillions and quadrillions of centuries, throwing out heat and light.
The milky way is nothing but a cloud of stars that seem to us as one mass, but which in reality are so far apart that thousands of suns like ours with all their planets could revolve among them without ever coming into collision." Gabriel remembered the travelling of sound and light.

"Their velocity is insignificant compared with the distances in space.

The sun, which is the nearest to us, is still so far that for a sound to go from us to it would take three millions of years.