I've never been sure how expansion of the universe is plausible? Isn't it just another term for the light from that distance of "expansion", which takes what billions of years to reach earth, finally reaching here, after being fractured and refractured, bent, even slowed down or sped up through different gases that may not exist anywhere in our solar system, thus causing the appearance of an expanding universe. And then if the universe is expanding, why are we the center of it, wouldn't we also be getting further away from stars on the other side of the sphere of the universe, and keeping closer distances to the stars that are, at a given time time, the same distance from earth and our sun, but on the same side of the expansion. sorry, bit of a hijack and ramble at that.