As the full moon shines in the night sky this weekend, take a moment to revel in its beauty and search for a large, dark plain. The surface feature is Mare Tranquillitatis, or the Sea of Tranquility, ...

On July 20, 1969, Apollo 11 astronaut Neil Armstrong announced his historic arrival on the ancient lava plain of Mare Tranquillitatis with the following message to NASA: "Houston, Tranquility Base ...

CAPE CANAVERAL, Fla. (AP) - Scientists have confirmed a cave on the moon, not far from where Neil Armstrong and Buzz Aldrin landed 55 years ago, and suspect there are hundreds more that could house ...

The full Moon including the Sea of Tranquility and Apollo 11 landing site, July 16-24, 1969Michael Collins [Apollo 11], 1969 Subscribe now to view details for this work, and gain access to over 18 ...

This view of the rising earth greeted astronauts Borman, Anders, and Lovell as they came from behind the moon after the lunar orbit insertion burn during Apollo 8 moon flight, 1968. (Photo via Getty ...

In Sea of Tranquility, named after the "silent flatlands" on the moon where the Apollo astronauts landed, the small settlement of Caiette on Vancouver Island is a crucial reference point from The ...

Editor’s note: A version of this story appeared in CNN’s Wonder Theory science newsletter. To get it in your inbox, sign up for free here. As the full moon shines in the night sky this weekend, take a ...