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by 4gotunameagain 471 days ago
As with everything in aerospace, the reason is a trade-off you are unaware of. In order to launch an RTG you need to abide to extensive compliance requirements that ensure no ball of plutonium lands in someone's head. Ergo weight. In space, weight is everything.

You are one internet search away from finding the specific power of RTGs and of solar panels on the moon.