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Hubble is a plane.
It's a great theory! Their are theories that the human brain imagines everything. The brain tells the eyes what to see potentially according to some theories. This theory could be simialar and say that everybody is a figment of your imagination.
Well what I think disproves is the fact that discoveries happen in other regions of the earth that you may not have known of. Therefore your mind didn't generate that research but the other person did and it'd be impossible to already have known or generate the idea of every research ever conducted with your own brain alone.