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A comment on Mars Helicopter successfully completed its second flight. Parent comment

Re:Mars Helicopter successfully completed its second flight by caf on Thursday April 22, 2021 @09:15PM (#26910028)
Wrong isotope. The Pu238 used in RTGs is not fissile (does not undergo a chain reaction) - it decays by alpha decay. The fissile isotope used in weapons is Pu239.
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