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)
Friday, September 12, 2014
Thermal Power
Today's Pluto Picture of the Day shows a cylinder of Plutonium 238 used in radioisotope thermoelectric generators on vehicles such as Voyager and New Horizons.
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