Space Travel Without Understanding How to Create Atomic Weapons?

I have a universe where humanity has produced various civilizations on multiple planets (and no planet has achieved a single world government); and very few of these countries possess the know-how of nuclear weapons- but space travel is possible, although it can be expensive and difficult.

My question is this: Could basically all nations have the technology to be space-faring, yet not independently produce nuclear weapons? Can these two technologies be separate?

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Space Travel Without Understanding How to Create Atomic Weapons?

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