[–] • 0 pt Why coal? Why coal? link [–] • 1 pt Coal is a very energy-dense substance. Apparently an adequate fuel source for ion-drive spacecraft engines. Coal is a very energy-dense substance. Apparently an adequate fuel source for ion-drive spacecraft engines. parent link [–] • 0 pt Interesting. Interesting. parent link
[–] • 1 pt Coal is a very energy-dense substance. Apparently an adequate fuel source for ion-drive spacecraft engines. Coal is a very energy-dense substance. Apparently an adequate fuel source for ion-drive spacecraft engines. parent link [–] • 0 pt Interesting. Interesting. parent link
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