>Theories of how galaxies should move is contradicted by empirical

We are certain now that there's energy in the vacuum of space. So as the universe expands, according to the square cube law, the amount of energy increases far above the rate of expansion. This is why in the early universe the force of gravity dominated but as we expanded the force of dark energy now dominates.

What we don't know yet is the amount of that energy per unit of vacuum, we're still trying to work that out.

>>8455784
retard

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>>8455784

There's a bit of truth in every bait, so I'll explain it to you like you're being genuine.

It's a hard science physicists don't claim to know what "dark matter" or "dark energy" is.

Some people have come up with some hypotheses that can be tested. Some of them have been shown to be false. Others remain undetermined from current observations.

Some people have come up with hypotheses that we're unable to test now, but may be able to be tested in the future. These hypotheses are naturally greeted by more skepticism from others in the field.

These are great intros to the topics:

Dark Matter: https://youtu.be/IhG1kHbRppY

Dark Energy: https://youtu.be/7w1t5ipDkjE

>>8455784
they didn't move sporadically different than they were supposed to, they moved in the expected pattern just off by a factor of some mass. They still obeyed all the laws for the matter+dark matter mass, not some other crazy model

>>8455784
>>8455821
Additionally, it makes sense from the particle side of things as well. Though the Standard model has many flaws, it has explained and predicted many new particles.

In it, there appear to be a hierarchy of particles, in which gradually fewer forces interact.
> Strong, E&M, weak, gravity
> E&M, weak, gravity
> weak, gravity
> ???

Symmetry suggests that there are particles below neutrinos and leptons that interact only via the gravitational force. This has been dubbed "dark matter".

Its not some weird, exotic, "spooopy" matter. The hypothesis is that is a yet-undiscovered particle that only interacts via gravity, which would fit in well with the symmetry evident in the rest of the standard model.

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>>8455784
>Observe unexplained phenomena
>Give phenomena a name that clearly implies it's unexplained
>"Huur how can you say thats real if you cant of explain it?"
For fuck's sake.