The Universe: ALIEN PLANETS and the Great Unknown *3 Hour Marathon*

Have planet hunters finally found proof of other Earthlike worlds? Astronomers have now discovered over two hundred alien worlds, beyond our solar system, that were unknown just a decade ago. Learn more in this full episode marathon of "The Universe".

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#history #history_channel #history_shows #history_channel_shows #the_history_channel #documentary_history_channel #history_documentary #documentary #history_channel_full_episodes #documentaries #history_channel_documentaries #the_universe #history_the_universe #the_universe_show #the_universe_full_episodes #the_universe_clips #full_episodes #watch_the_universe #the_universe_episodes #planets #the_solar_system #space_documentaries #solar_system #alien_planets #the_great_unknown

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