Of course. Almost everything can be used as a ruler. And as a clock too. And the SI definition of density measurements changes too. So, the measured density may not change at all. No. You have ignored the change in the definition of the density, which is what is related to the amount of fusion which happens in the Sun. Of course. Not checked the numbers, but, of course, they would shrink relative to the absolute distances, which we can measure only by comparison with far away galaxies. Yes. The point being? There is no dark side at all with these assumptions. This is simply what the equations of physics - not even my, but those accepted by the mainstream - tell us. They are covariant. And what follows is that the Earth, if moving with a different velocity than now (say, in half a year, when its velocity around the Sun is quite different from now) is Lorentz-contracted in a different way. Together with all its neutrons and protons. Of course, for making shrinking rulers unobservable, because everything I could use to detect this shrinking is shrinking itself, I need a covariant theory. But this is what the mainstream gives me. So, if you think that assuming a covariant theory is absurd, on the dark side or so, please argue with the mainstream. I accept this mainstream theory, at least partially, for all matter fields. My ether theory contains some non-covariant terms for gravity - but this is what makes me an outsider.