Were Christopher Marlowe and Galileo Galilei alive at the same time?
Yes. Christopher Marlowe and Galileo Galilei were alive at the same time, from c. 1564 to 1593.
Galileo Galilei was 29 when Christopher Marlowe died.
Christopher Marlowe
English dramatist, poet and translator
Born c. 1564 · died 30 May 1593 (Julian calendar)