From Mark Anderson at New Scientist:
Fresh suspicions have reopened the case against dark matter, forcing a fundamental rethink of the familiar force that keeps our feet on the ground
…
But what if we never really knew gravity at all? What if out there, beyond where we can easily keep our eye on it, the universal force doesn’t stick to the rules? (paywall) More.
It’s hard to know what to make of the question. Whatever gravity does is the rules.
See also: A proposed dark matter solution makes gravity an illusion
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more likely the missing dark matter does not exist.
reference SPIRAL cosmological redshift hypothesis for a big bang hypothesis that works w/o the missing dark matter and without the missing dark energy.
more likely the missing dark matter does not exist
something is bending light around galaxies.
https://science.nasa.gov/astrophysics/focus-areas/what-is-dark-energy
https://en.wikipedia.org/wiki/Dark_matter
MOND is the usual suspect for why gravity is supposedly a problem. But what is really going on is an inability to discover Dark Matter. Very surprisingly for me, anyway, is the panic pervading the community when a speculative, but widely supported, theory fails. E.g. inflation, dark matter, WIMP, fifth force, dark energy, Big Bang Nucleosynthesis. Instead of reconsidering the failed model, newer and more exotic models are invoked at the drop of a hat. There appears to be no appreciation of what is essential and what is speculative. Sort of like calculating risks from radiation, or risks from global warming. Everything becomes catastrophic. It is as if physicists have lost all common sense.