Astronaut Buzz Aldrin was one of the first people to walk on the moon. He and flight commander Neil Armstrong made the Apollo 11 moonwalk in 1969.
Astronaut, military pilot, and educator, Neil Armstrong made history on July 20, 1969, by becoming the first man to walk on the moon.
Bluford became the first African American to travel in space in 1983, as a mission specialist aboard the space shuttle Challenger.
When the space shuttle Columbia blasted off on July 23, 1999, pilot Eileen Collins became NASA's first female shuttle commander.
Michael Collins is a former astronaut who was part of the Gemini 10 and Apollo 11 missions, the latter of which included the first lunar landing in history.
Christopher Ferguson became famous when NASA selected him to fly aboard Atlantis on the last ever space shuttle launch.
Yuri Gagarin was a Soviet cosmonaut who in 1961 became the first man to travel into space
John Glenn was the first U.S. astronaut to orbit Earth, completing three orbits in 1962. He has also served as an Ohio senator.
Gus Grissom transitioned from successful Air Force test pilot to NASA astronaut, despite a controversial landing in the Liberty Bell 7.
Chris Hadfield is a pioneering Canadian astronaut who became a global celebrity through his Twitter feed while aboard the International Space Station in 2013.
Doctor Mae C. Jemison is the first African-American woman ever to be a U.S. astronaut. In 1992, she flew into space aboard the Endeavour.
Jim Lovell is a former U.S. astronaut who commanded NASA's nearly disastrous Apollo 13 flight to the moon.
Barbara Morgan was the first teacher-astronaut to complete a shuttle mission on board the Endeavor in 2007.
Selected by NASA in 1990, Ellen Ochoa became the world's first Hispanic female astronaut in 1991.
In 1983, astronaut and astrophysicist Sally Ride became the first American woman in space aboard the space shuttle Challenger. Ride died on July 23, 2012 at the age of 61, following a battle with pancreatic cancer.
Alan Shepard became one of the original seven Mercury program astronauts in 1959. He later commanded the Apollo 14 flight.