“I'm convinced that sending people to Mars is so expensive that if you go once and bring the people back and then go again and bring the people back, we're eventually going to run out of money. But what if we send people the first time and they don't come back? What if they stay there?”

American former astronaut, aeronautical engineer, and fighter pilot

Buzz Aldrin is an American former astronaut, aeronautical engineer, and fighter pilot. He is known for being the second person to walk on the Moon, following mission commander Neil Armstrong. Aldrin served as the pilot of NASA’s Gemini 12 mission in 1966, during which he made three spacewalks. He later flew as the Lunar Module Eagle pilot on Apollo 11 in 1969. He is now the last surviving member of that crew and the oldest living astronaut.