![October 1965: Scott, left, and Mark with TK October 1965: Scott, left, and Mark with TK](https://api.time.com/wp-content/uploads/2014/12/mark-sott-kelly-astronaut-012.jpg?quality=85&w=2400)
By TIME Photo
![October 1965: Scott, left, and Mark with TK October 1965: Scott, left, and Mark with TK](https://api.time.com/wp-content/uploads/2014/12/mark-sott-kelly-astronaut-012.jpg?quality=75&w=2400)
![Scott and Mark on the porch in 1965 Scott and Mark on the porch in 1965](https://api.time.com/wp-content/uploads/2014/12/mark-sott-kelly-astronaut-011.jpg?quality=75&w=2400)
![June 1966 June 1966](https://api.time.com/wp-content/uploads/2014/12/mark-sott-kelly-astronaut-008.jpg?quality=75&w=2400)
![December 1966: Mark and Scott in West Orange, N.J. December 1966: Mark and Scott in West Orange, N.J.](https://api.time.com/wp-content/uploads/2014/12/mark-sott-kelly-astronaut-005.jpg?quality=75&w=2400)
![1967: Scott, left, and Mark 1967: Scott, left, and Mark](https://api.time.com/wp-content/uploads/2014/12/mark-sott-kelly-astronaut-010.jpg?quality=75&w=2400)
![Aug. 1967: Mark (left) and Scott with their MOM CK? at the Turtle Back Zoo in West Orange, N.J.](https://api.time.com/wp-content/uploads/2014/12/mark-sott-kelly-astronaut-006.jpg?quality=75&w=2400)
![April 1968: Mark, left, and Scott April 1968: Mark, left, and Scott](https://api.time.com/wp-content/uploads/2014/12/mark-sott-kelly-astronaut-013.jpg?quality=75&w=2400)
![1970: Mark, left, and Scott on the Jersey Shore 1970: Mark, left, and Scott on the Jersey Shore](https://api.time.com/wp-content/uploads/2014/12/mark-sott-kelly-astronaut-001.jpg?quality=75&w=2400)
![1970, Mark and Scott at home in West Orange, N.J. on Christmas Day 1970, Mark and Scott at home in West Orange, N.J. on Christmas Day](https://api.time.com/wp-content/uploads/2014/12/mark-sott-kelly-astronaut-003.jpg?quality=75&w=2400)
![1971: Mark, left, and Scott in 1971 1971: Mark, left, and Scott in 1971](https://api.time.com/wp-content/uploads/2014/12/mark-sott-kelly-astronaut-002.jpg?quality=75&w=2400)
![April 1972: Mark (left) and Scott at home in West Orange, N.J. April 1972: Mark (left) and Scott at home in West Orange, N.J.](https://api.time.com/wp-content/uploads/2014/12/mark-sott-kelly-astronaut-007.jpg?quality=75&w=2400)
![1974: Scott (left) and Mark with their mother, TK NAME 1974: Scott (left) and Mark with their mother, TK NAME](https://api.time.com/wp-content/uploads/2014/12/mark-sott-kelly-astronaut-004.jpg?quality=75&w=2400)
![1979: Scott, left, and Mark pictured with TK? 1979: Scott, left, and Mark pictured with TK?](https://api.time.com/wp-content/uploads/2014/12/mark-sott-kelly-astronaut-009.jpg?quality=75&w=2400)
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