So I had an interesting idea

[SuperWeegee4000]

What if dark matter and dark energy are contents from another universe, one we're currently colliding with? We could be inside an advancing "wave" of material from the other universe, beyond which galaxies can't stay together.

There are of course problems. This would mean that time and space as we know them have to exist outside our own universe. This doesn't sound very likely, but it is possible. What do you think? Could we be a colliding universe?

[DaveofDefeat]

Wut. /10Char

[KvickFlygarn87]

Well, that makes sense. Ish. But would it not be very unprobable that the matter has exactly the opposite charge?

[lajoswinkler]

Dark matter is more or less equally distributed throughout the universe, so there's no "wave" advancing anywhere. We aren't colliding with anything as we might be immersed in something.

What might (in the realms of theoretical physics) be the case is that dark matter is to our 3D(+time) world what infinitely thin slice of apple is to a 2D world through which it is gliding. Probably not, but certainly more viable solution than the collision.

[DaveofDefeat]

Lets clarify, Dark matter is a theory used to explain why the galactic orbital speeds of objects located far from the galactic center are faster than than our current understanding of gravity can explain. The two theory's to explain this is one Dark matter, a unknown something that only seems to interact by gravity and does not absorb or release electromagnetic waves.

This could be some yet unknown particle or simply a bunch of hydrogen gas that we are having trouble detecting. The second theory is that our current theory of gravity does not accurately predict the effects of gravity on the galactic scale. Dark energy, something mostly unrelated to dark matter aside from the name. Is used to describe why the expansion of the universe is accelerating, something the big bang theory fails to predict. I don't see how either of these things can be explained by colliding with an entirely different universe.

I'm sure I got something wrong there, but I am confident k^2 will come by.