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Are there no Buddhas from other universes that are equal to our Buddha?
There can only ever be one fully enlightened Buddha (Sammasambuddha), like our Buddha Gautama, at a time.
The next fully enlightened Buddha is called Metteyya.
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When the Buddha speaks of worlds he is talking about that in the world by which the world is perceived & conceived because that is what is called a world in that training.
There are many subjective frames of percepience by which the world is conceived and no two frames of perception are the same.
It is proven that there is no simultaneity of perceived events between observers (physics) and it helps to grasp this to appreciate the semantics of the dhamma and how each world is different from another.
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All this passage really says is that attaining buddhahood is the highest ideal one can reach for, in this universe or any other. This isn't about 'our' buddha, or this buddha or that buddha. This is about the state of being awakened.