Native said:
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What "existing phenomenon" are you talking about? That´s just ONE of the problems Sabine Hossenfelder mention: The "illusive dark ghost stuff" has never been directly detected since it was invented.
Yes, some *circumstantial measurings* have been made, but NOT looked at from other perspections but "gravity", which is just 1/4 part of the fundamental forces, and the weakest part too.
If cosmological scientists don´t include all forces, they inevitably will have to insert unexplained *forces and energies* where the other 3/4 EM fundamental forces are at play. And this is just what they do all over the places in the observable Universe.
And if *you* don't include *all* forces, your explanation will be broken as well.
In other words, you need to include gravity.
What you don't seem to understand is that cosmologists *do* use E&M in their explanations *where appropriate*. For example, in understanding the dynamics of gas and dust clouds irradiated by a hot star, the E&M effects become important and plasma physics is used.
Around neutron stars or black holes, the high temperatures naturally produce plasmas and E&M is included in our understanding of what is going on.
Galactic astronomers *routinely* measure the strength of the magnetic fields around our galaxy as well as others.
So E&M is NOT something that is neglected. It is used *when appropriate*.
But it simply doesn't produce the effects you seem to think it does on a galactic scale. For example, the galactic E&M fields are *way* too weak to actually affect the motion of stars in any detectable way. We know how strong they are and the effects of fields of those strengths.
You like to point out gamma rays from near the core of our galaxy, not realizing that those are produced in a very high energy and strong field situation. And they are NOT ignored by standard astronomers: in fact, they give good clues to what is going on near the core. But, again, they are irrelevant to the motion of stars thousands of light years away.
What you pretty consistently fail to understand is the difference in strength of different E&M fields. You point to known effects around neutron stars, for example, where the E&M fields are immense and then claim the same effects apply on the galaxy as a whole, where the fields are incredibly weak. Those differences are relevant.
The E&M field produced in a current by an ordinary battery is MUCH larger than that of the galactic magnetic field.