[Answer] 6. Which one of the Mercury Seven astronauts became the oldest human ever to travel in space when he flew on the space shuttle in 1998 at the age of 77?

Step 1 : Introduction to the question "6. Which one of the Mercury Seven astronauts became the oldest human ever to travel in space when he flew on the space shuttle in 1998 at the age of 77?"

...1. Scott Carpenter 2. Gordon Cooper 3. John Glenn 4. Deke Slayton Glenn flew the STS-95 mission on the Space Shuttle "Discovery" from October 29, 1998 to November 7, 1998. At the time, Glenn was a US Senator and his flight was also notable because he became only the third sitting American politician to travel in space after Senator Jake Garn and Congressman (later Senator) Bill Nelson.

Step 2 : Answer to the question "6. Which one of the Mercury Seven astronauts became the oldest human ever to travel in space when he flew on the space shuttle in 1998 at the age of 77?"

John Glenn:

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