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A plutonium-238 pellet assembled in a high-strength graphite impact shell for Multi-Mission Radioisotope Thermoelectric Generator.

The file is copied from Wikimedia Commons {accessed 2021-01-01}:
https://commons.wikimedia.org/wiki/File:Fueling_of_the_MSL_MMRTG_002.jpg

See also: https://rps.nasa.gov/power-and-thermal-systems/power-systems/ {accessed 2021-01-01}

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  mars_radioisotope_thermoelectric_generator.jpg
You are permitted to use this image freely, for any legal purpose including commercial (the permission is given, so there is no need to ask for it explicitly again), but you must always include the following credits: 

Idaho National Laboratory, [[https://creativecommons.org/licenses/by/2.0/|CC-BY-2.0]]
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{{tag> Plutonium-238 Pu-238 Radioactivity Heat_source Nuclear_fission Files}}