Neil Armstrong, the first man to walk on the moon, passed away this weekend from complications caused by recent heart surgery. He was 82 years old.

Armstrong was a quiet, modest man, whose accomplishments he always regarded as simply doing his job. Regardless, most view him as one of the greatest heroes in history.

Many astronauts have credited Armstrong with being their inspiration, and have taken to Twitter to express how much his contributions to history have affected them.

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