This effect is used on space craft, using the delta temperature between radiation from nuclear material and the vacuum of space -- it's how the voyager space craft had the power to communicate while so far from the sun.
Russia also used it with nuclear material to power light houses, 'cause Russia.
Clutterking t1_j57zpfh wrote
Reply to How do non electric heat operated fans work? by ranman12953
This effect is used on space craft, using the delta temperature between radiation from nuclear material and the vacuum of space -- it's how the voyager space craft had the power to communicate while so far from the sun.
Russia also used it with nuclear material to power light houses, 'cause Russia.
https://en.m.wikipedia.org/wiki/Radioisotope_thermoelectric_generator