Matter being repelled by gravity
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Let's say that, in a universe modelled after Patema Inverted, there are two "flavors" of matter: one which is attracted by gravity (so when dropped on Earth it would fall down), and one which is instead repelled (so when dropped on Earth it would fall up). For the rest the interactions are the same.
Would we ever be able to notice such repulsive substance in our present world?
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