Some say solid fuel is a bowl of warm porridge, some say glowing logs or coal, charcoal for the barbie, some say other things that I have little knowledge about: rocket fuel or atomic isotopes for example. We're still with logs just now, they're working well on the domestic front. Maybe too well, perhaps a log burning rocket isn't a bad idea, very Jules Verne when I think about it. His ghost may be whispering to me, that still small voice can be persistent. A greener and long term proposition for a lower-tech version of space exploration. Just grow a few trees on the moon ready for your return journey or wait a while longer and go interstellar. Some patience might be needed and the wood drying times are critical for decent combustion.
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