Harlow Shapley Quote

Millions of planetary systems must exist, and billions is the better word. Whatever the methods of origin, and doubtless more than one type of genesis has operated, planets may be the common heritage of all stars except those so situated that planetary materials would be swallowed up by greater masses or cast off through gravitational action.

Of Stars and Men: Human Response to an Expanding Universe, Chapter 7 (p. 112), Beacon Press. 1958