>
> Time does not appear to pass for the particle *to an outside observer*.


Then how can it appear to oscillate to me?

Time passes just fine in the frame of the particle. But to the particle,
> time appears to stop in the rest of the universe.


Right.

This is one reason that you can't actually accelerate real particles
> all the way to the speed of light.


Particles with a rest mass.

However, because of the expansion of the universe overall, there are
> objects that are moving away from us at speeds greater than the speed
> of light. You're right, we can't see or interact with them in any way.


No, C is C. Two photons shot toward each other at C, are receeding from
their emitters at C, and approaching each other at C.
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