In space, heat can go 'backwards' -- from cold places to hot. It just needs a little squeeze, Philip Ball explains.
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References
Wunenburger,R., Garrabos, Y., Lecoutre-Chabot, C., Beysens, D. & Hegseth, J. Thermalization of a two-phase fluid in low gravity: heat transferred from cold to hot. Physical Review Letters 84 4100 - 4103 2000.
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Ball, P. Pump up the volume. Nature (2000). https://doi.org/10.1038/news000511-3
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DOI: https://doi.org/10.1038/news000511-3