Robotic space probe launched in 1986 to explore Jupiter and its moons (7)

I believe the answer is:

galileo

(Other definitions for galileo that I've seen before include "Sixteenth and seventeenth century Italian astronomer tried for heresy" , "Astronomer - ogle Ali (anag)" , "Italian scientist and astronomer" , "Great Italian astronomer and physicist of 16th/17th century" , "Italian astronomer, a founding father of modern science" .)

I've seen this clue in The Guardian.

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