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how many astronauts are there today
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number of astronauts by country
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how many astronauts are there today, how many astronauts are there total, how many us astronauts today, how many nasa astronauts are there, how many current astronauts are there, how many american astronauts have there been, how many active astronauts are there, how many astronauts are in space, how many astronauts does nasa have, how many people become astronauts, number of astronauts by country, how many astronauts work for nasa