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Except Neptune distortions didn't require assumption of exotic types of matter, just an undetected lump of regular matter, so the analogy doesn't quite work. It's not a limitation of instruments or observations. It's an ontological limitation of theory.
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"gravity" itself has undergone 2 redefinitions that completely altered its ontological character. It was a "force" under Newton, a space-time curvature effect under Einstein, and now a "wave-particle" under quantum gravity type theories. So the word doesn't matter much.
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