Discuss as:

Holiday calendar: From the moon to the earth

Thousands of pictures of Earth have been taken from space, but few have had as much impact as the picture taken by Apollo 8's crew exactly 42 years ago. The "Earthrise" photograph, showing our planet hanging in a black sky, was taken as the mission's three astronauts swung around the moon on Christmas Eve 1968. It's considered the first color photo of the full Earth made from deep space. The late photographer Galen Rowell called it "the most influential environmental photograph ever taken."

The view from the moon fosters the realization that this one planet is our one home — a home that must be protected and treasured. In fact, such views are said to spark a phenomenon called "the overview effect," a feeling of spiritual transcendence and universal connection that's often experienced by astronauts during spaceflight.

During the Apollo 8 astronauts' Christmas Eve broadcast, the astronauts took turns reading from the Book of Genesis — and commander Frank Borman ended with this wish: "From the crew of Apollo 8, we close with good night, good luck, a Merry Christmas and God bless all of you — all of you on the good Earth."

Such are our wishes for you on this Christmas Eve.

One more picture of Earth from space remains to be revealed in our Cosmic Log Space Advent Calendar — a final treat for Christmas Day. Click on the links below to see the previous pictures in this series, as well as images from other space-themed Advent calendars:

Connect with the Cosmic Log community by hitting the "like" button on the Cosmic Log Facebook page or following msnbc.com's science editor, Alan Boyle, on Twitter (@b0yle).