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Wellsprings
greek-cosmologyfeatured in 12 works

Infinite Worlds

Ours may not be the only world: countless cosmoi are forever forming and dissolving across boundless space.

"Infinite worlds" (apeiroi kosmoi) is the atomist idea that infinitely many worlds arise and perish as atoms collide and clump together throughout an endless void. Leucippus and Democritus (5th c. BCE) developed it, and Epicurus and the Roman poet Lucretius (1st c. BCE) gave it famous voice. The thesis directly challenged Aristotle's single, finite, Earth-centered cosmos — and, two millennia later, fed early modern debates over whether there might be other worlds besides our own.

How it traveled

  1. Metaphysics
    Chalcis · -322
    explains
  2. De caelo
    Chalcis · -322
    challenges
  3. Epistula ad Herodotum
    Athens · -270
    explains
  4. De Rerum Natura
    Rome · -55
    explains
  5. de Natura Deorum
    Formiae · -43
    explains
  6. de Finibus Bonorum et Malorum
    Formiae · -43
    explains
  7. Lucullus
    Formiae · -43
    explains
  8. De Defectu Oraculorum
    Chaeronea · 120
    explains
  9. Vitae philosophorum
    · 240
    explains
  10. Placita Philosophorum
    explains
  11. Praeparatio Evangelica
    explains
  12. Refutatio Omnium Haeresium (= Philosophumena)
    explains

Key passages(20)

Fragments & Testimonia · Leucippus

Very high

Vitae philosophorum · Diogenes Laertius

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Vitae philosophorum · Diogenes Laertius

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Vitae philosophorum · Diogenes Laertius

Very high

Epistula ad Pythoclem [attributed] · Epicurus

Very high
Very high

De Defectu Oraculorum · Plutarch

Very high

De Defectu Oraculorum · Plutarch

Very high

De Defectu Oraculorum · Plutarch

Very high

Refutatio Omnium Haeresium (= Philosophumena) · Hippolytus

Very high
Very high

De caelo · Aristotle

Very high
Very high

Epistula ad Herodotum · Epicurus

Very high

Epistula ad Herodotum · Epicurus

Very high

De Defectu Oraculorum · Plutarch

Very high

Placita Philosophorum · Pseudo-Plutarch

Very high

Facta et Dicta Memorabilia · Valerius Maximus

Very high