How can we know the shape of the Universe?

[Dark matter]

Technically, there is not shape of the universe since there is nothing out side the universe.

[antimatter]

We don't know that...

 

Of course we might as well.

[Riogho]

Technically, there is not shape of the universe since there is nothing out side the universe.

 

Isn't the definition of Universe, everything?

[antimatter]

Yes, everything that exists physically.

There's not 'outside of the universe' to even talk about, it's just...not...there/true/right/real...I think that's the best I can phrase it right now.