It would be the universe since
the universe refers to the whole world!
No.
The word "universe" means "all space, all time, and everything in them". It's the concept that includes everything, and bigger than which nothing is.
No the Milky Way is only a galaxy in space (the Universe) and is very small indeed by comparison.
The universe IS space, plus everything that's in it.
A universe is bigger than a planet.
A universe is bigger than an organism.
the universe is bigger
the universe is bigger
same
The Universe is bigger. The Universe encompasses everything we know; it isn't known whether there are other universes.
It is believed that the Universe is much, much bigger than the observable Universe, but exactly how much bigger is not currently known.It is believed that the Universe is much, much bigger than the observable Universe, but exactly how much bigger is not currently known.It is believed that the Universe is much, much bigger than the observable Universe, but exactly how much bigger is not currently known.It is believed that the Universe is much, much bigger than the observable Universe, but exactly how much bigger is not currently known.
The Universe