The following ideas are primarily mine alone, the good, the bad and the ugly, albeit based on and influenced by reading multi volumes of tomes in modern cosmology. However, I’m also quite sure that numerous others have quite independently thought somewhat similar, if not exact, thoughts as well. Therefore, I’ll take no credit for being right, if I don’t get blamed for being wrong!
UNIVERSES IN COLLISION
We know our own Universe (not space) is expanding and that that rate of expansion is ever accelerating because of dark energy (a sort of anti-gravity). The overall density of the Universe decreases with each passing second. Now, what if there is a second Universe or a lot of Universes – even a Multiverse – and all are equally expanding because of dark energy? What happens if one expanding Universe bumps into another expanding Universe? You can only pack so many inflating balloons into a room as it were! Better still, what if our expanding Universe has already collided with another and the energetic repercussions of that ‘bump’ are even as I type heading towards us at light speed? Oops! However, I think that there wouldn’t be hard and fast (immovable object/irresistible force) boundaries to universes, and thus universes could pass through one another, akin to galaxies in our Universe that can glide through each other like phantoms.
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