Who said "I put up my thumb and it blotted out the planet Earth", Space traveler whose first five letters, spelled backward, are oddly appropriate

Now we are looking on the crossword clue: Who said "I put up my thumb and it blotted out the planet Earth", Space traveler whose first five letters, spelled backward, are oddly appropriate.
it’s A 156 letters crossword puzzle definition. See the possibilities below.

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Possible Answers: NEILARMSTRONG.