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)
Monday, March 21, 2016
Deep Map
NASA has released a new map of the gravity of Mars, allowing us to look inside the Red Planet's structure.
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