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It’s got to be Dark Matter. So many astrophysicists have spent so much time thinking about this stuff and all they’re really sure about is that there must be much more matter in the Universe than we can see, and yet we never actually seem any closer to knowing what it is. In conjunction with Dark Energy it just leaves the layman with the awkward possibility that maybe our model of The Universe is just fundamentally flawed somehow.
I think that eiher, we fundamentally misunderstand gravity at a quantum level, and we are seeing all of the matter there is, but can't anyway calculate gravity with our current understanding of it, or, we fundamentally misunderstand how time, gravity, and space interact.
Technically it's not a theory, wouldn't even classify this as hypothesis. Calm your tits.