At 77, he went back to space.

On October 29, 1998, shuttle Discovery lifted off from Florida on mission STS-95 with Senator John Glenn aboard. Thirty-six years earlier, in 1962, Glenn had become the first American to orbit Earth.

His return made him the oldest person to fly in space at the time. During the roughly nine-day mission, researchers studied how spaceflight affected his body, looking for links between space travel and aging.

Glenn landed a hero for the second time in his life.

What do you think kept him chasing the stars at an age when most people retire?

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