Michael Collins is famous for being the command module pilot of Apollo 11. This means he was the one member of his team that didn't get to walk on the moon. His legacy will likely always include this fact but, as you might expect from any astronaut, there is much more to "the loneliest person in the universe."
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Collins was born in Rome in 1930. He attended West Point, then worked as a flight test officer for the Air Force. He logged about 5,000 hours of flight time. His first mission for NASA was as the backup pilot for Gemini X, which launched July 18, 1966. He performed a spacewalk during this mission. Apollo 11 was is second and last mission. Collin logged a total of 266 hours in space. In a talk at MIT, he said he was a likely candidate for the commander seat on Apollo 17. Had he not retired, he may have been the last person to walk on the moon.
At 78, in 2009, Collins did a Q&A for NASA to address the most common questions he is asked. He says he was honored and lucky to be a part of Apollo 11. He lists the activities that now fill his time including fishing, painting, biking, "worrying about the stock market, and searching for a really good bottle of cabernet under ten dollars." He classifies himself as "moderately busy." In terms of his hopes for the space program, Collins is rooting for a mission to Mars. It was his favorite planet as a kid and still is - by comparison, he says the moon is not nearly as interesting.
Read more about Michael Collins:
NASA: Statement from Apollo 11 Astronaut Michael Collins
Lyndon B. Johnson Space Center: Biographical Data
MIT News: Michael Collins: "I could have been the last person to walk on the moon"