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What is the nature of knowledge? This chapter examines the science fiction narrative of Battlestar Galactica to address puzzles and problems in epistemology. For example, knowledge has traditionally been defined as a true justified belief. However, this definition actually accepts accidentally true justified beliefs as knowledge. In Battlestar Galactica we see an excellent example of such a belief. Captain Adama claims he is searching for Earth, but he does not even believe it exists. Anyone who believes in Earth's existence based on Adama's testimony would have an accidentally true justified belief. Can such a belief be knowledge?

Battlestar Galactica begins with the ravaging of the known world. The survivors are demoralized, vastly outnumbered by the enemy, and homeless. Against this backdrop Commander Adama offers the promise of a new home where they'll be safe from the Cylons: Earth. But he lies. Yet, in a surprising twist of fate – though not to us who live here – it's later revealed that Adama told a “true lie.” Earth does exist and the Colonials' search for it isn't in vain. Undertaking the journey to this “mythical” home of the Thirteenth Tribe is momentous and filled with religious significance for the Colonial survivors. Faith in Earth's existence gives meaning to an otherwise hopeless situation and shapes the choices they make along the way.