From Muppet Wiki

Buzz Aldrin (b. 1930) is an American pilot and astronaut who was the Lunar Module Pilot on Apollo 11, the first lunar landing. He became the second human to set foot on the Moon.

Aldrin appeared in Sesame Street episode 4090, where he explained to Cookie Monster that the moon is made out of rock, and is not a cookie. He also appeared in a Healthy Moment with Telly. Telly dresses himself in an astronaut's helmet, and comments that he's running low on energy. Buzz Aldrin suggests that all he needs to do is eat some food.