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The Clue

NASA research center (7 letter answer)

The Answer

LANGLEY

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Notes

The answer LANGLEY is so rare that it appears less than once every 2500 puzzles.

Related Clues

Aeronautical pioneer

Definition

LANGLEY as a noun:

1. unit of solar radiation
2. (Langley, Samuel Pierpoint Langley) = United States astronomer and aviation pioneer who invented the bolometer and contributed to the design of early aircraft (1834-1906)