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Welcome to "On This Day ... in Space!" where we peer back in our archives to find historic moments in spaceflight and astronomy. So enjoy a blast from the past with Space.com's Hanneke Weitering to look back at what happened on this day in space!

On Dec. 21, 1968, NASA's Apollo 8 mission launched to the moon.

Apollo 8 was the second crewed mission in NASA’s Apollo program. It was also the first mission to bring humans to the moon. It lifted off from Kennedy Space Center in Florida on a Saturn V rocket.

This was the first time that a Saturn V launched with people on board. In the Apollo Command Module were astronauts Frank BormanJim Lovell and Bill Anders. The astronauts didn't land on the moon, but they flew in circles around it for a full day.

While in orbit, Bill Anders snapped a photo of Earth that he called "Earthrise," and this remains one of the most famous photographs ever taken during the Apollo program. This was also the first time anyone had seen planet Earth in its entirety from space with human eyes.

Apollo 8 Launched 1st Astronauts Around the Moon 50 Years Ago Today Despite Big Risks

Apollo 8 at 50: NASA Chief Speaks Out on a US Return to the Moon

Apollo 8 Astronaut James Lovell Looks Back On a Historic Flight Around the Moon 

Apollo 8: NASA's First Crewed Trip Around the Moon in Pictures

Catch up on our entire "On This Day In Space" series on YouTube with this playlist.

Email Hanneke Weitering at hweitering@space.com or follow her @hannekescience. Follow us @Spacedotcom and on Facebook