As time passes, fewer of the Lunar Astronauts remain.

NASA announced Friday that astronaut Edgar Mitchell passed away on Thursday, just one day before the 45th anniversary of his moon landing.

Dr. Mitchell was the lunar module pilot on Apollo 14, which launched in Jan. 31, 1971. He traveled to space alongside Alan Shephard and Stuart A. Roosa.

"As a member of the Apollo 14 crew, Edgar is one of only 12 men to walk on the moon," said NASA administrator Charles Bolden in a statement, "and he helped to change how we view our place in the universe."