Crossword Genius

Astronomer whose first and last name differ by one letter (7)

Ross

I believe the answer is:

galileo

(Other definitions for galileo that I've seen before include "Great Italian astronomer and physicist of 16th/17th century" , "Famous scientist" , "Famous Italian" , "was in trouble with the Inquisition" , "It. C 16 to 17 astronomer" .)

I've seen this clue in the Universal.
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