The Apollo 11 command module Columbia sits in the Mary Baker Engen Restoration Hangar in Virginia, where it is undergoing conservation. Dane Penland/National Air and Space Museum/Smithsonian Institution hide caption

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Dane Penland/National Air and Space Museum/Smithsonian Institution

The Smithsonian is sharing images of astronaut graffiti aboard the Apollo 11 command module, including this tribute to the spacecraft. Smithsonian Air and Space Museum hide caption

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Smithsonian Air and Space Museum

Apollo 11 climbs toward orbit after liftoff on July 16, 1969. In 2 1/2 minutes of powered flight, the S-IC booster lifts the vehicle to an altitude of about 39 miles, some 55 miles downrange. NASA hide caption

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NASA