These great hollow globes of artificial super-metals, and artificial transparent adamant, ranged in size from the earliest and smallest structures, which were no bigger than a very small asteroid, to spheres considerably larger than the Earth. (Olaf Stapledon, STAR MAKER)
Sunday, July 21, 2019
Active Moon
Today's Astronomy Picture of the Day is from the Sea of Tranquility during the mission of Apollo 11. Buzz Aldrin stands near the deployed Passive Seismic Experiment. It seems that our "dead" moon is surprisingly active. What causes this activity? Meteor hits? Collapsing faults? Giant moon beasts?
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