Autores:
  • Una galaxia está compuesta de gas, polvo y estrellas: miles y miles de millones de estrellas. Cada estrella puede ser un sol para alguien.

    Cosmos ch. 1 (1980). Sagan denied using the phrase "billions and billions," as caricatured by comedian Johnny Carson, but the above quote approaches that phrase, and Sagan was extremely fond in his writing of the word billion or billions.