Discovery Channel is an American basic cable and satellite television channel that is the flagship television property of Discovery Communications, a publicly traded company run by CEO David Zaslav.
NASA TV is the television service of the United States government agency NASA. NASA TV provides 24-hour broadcasting of live and recorded events and documentaries aimed toward the general public.
National Geographic Channel is a South Korean subscription television channel that airs non-fiction television programs produced by the National Geographic Society.
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