A Good Defence of Dark Matter

From 37:00, there is an impressive defence for the existence of dark matter (or something much like it), based on the motion of Andromeda (Vera Rubin, 1975, 42:19 following).

Note the focus on operational, you-can-see-it-with-your-eyes-and-measure-it science. Not unprovable conjectures on what might have happened, long ago.

This does not validate the various theories on Dark Matter: the current ones don’t measure out, including the “Lambda cold dark matter (ΛCDM)“.

But, in real time and before our eyes, something is making the Andromeda Galaxy (…and all the other ones we have measured…) behave in a heavier manner than they should, judging strictly by their lighted mass.

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