Authors:

Each of us is a tiny being, permitted to ride on the outermost skin of one of the smaller planets for a few dozen trips around the local star.

Carl Sagan, Ann Druyan (2011). “Shadows of Forgotten Ancestors”, p.30, Ballantine Books
Each of us is a tiny being, permitted to ride on the outermost skin of one of the smaller planets for a few dozen trips around the local star.