Which Greek school of thought naturally led to the possibility of extraterrestrial life?

• A. The Stoics
• B. The atomists
• C. The Pythagoreans
• D. The Sophists

Answer: (B)

The idea being tested is that belief in life beyond Earth grows out of the atomists’ view of a vast cosmos formed by tiny, indivisible atoms moving through empty space. Atomists like Democritus and Leucippus held that the void allows countless combinations of atoms to make many different worlds, not just the one we inhabit. Because there can be many worlds with their own natural histories, it seems natural to consider that some of these worlds could harbor life. This openness to a multitude of worlds is what links atomism most directly to the possibility of extraterrestrial life.

The other schools don’t push that same cosmological idea. The Stoics imagine the cosmos as a single, rationally ordered whole, with life understood within that one system rather than as a swarm of separate worlds. The Pythagoreans emphasize mathematical harmony and cosmic order, not a pluralistic universe with inhabited worlds. The Sophists focus on rhetoric and human affairs rather than physics or metaphysics about other worlds. Because of its explicit commitment to a plurality of worlds within the void, atomism best explains why the possibility of extraterrestrial life arises in ancient Greek thought.