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aether
subjectfact 
aetherhas definition In Aristotelian physics, the fifth element, of which the stars and planets are made.2001-09-27 09:34:04.0
has definition In Classical physics, an invisible medium that was thought to suffuse all space.has source: Ferris, T. 1988 Coming of Age in the Milky Way, Morrow, 2001-09-27 09:34:04.0
is a kind of outdated belief2001-09-27 09:34:04.0