> all the atoms in our universe/galaxy/solar system with a mass up to that of iron are formed in the core of stars in stellar fusion. all is a strong word for

> all the atoms in our universe/galaxy/solar system with a mass up to that of iron are formed in the core of stars in stellar fusion. all is a strong word for example: the nuclear fusion experiment in the article, that would have produced a few atoms heaver that hydrogen (not to mention all the nuclear bombs that had a fusion stage)