Very, very close, but not quite. The shape of the universe is determined by its total density parameter, Ω0. This is made up of three other density parameters: the mass density of ordinary matter, the mass density of relativistic particles, and the mass density of dark energy, and is expressed as so:
Ω0 = Ωm + Ωrel + ΩΛ.
There are three solutions for the total density parameter:
- If Ω0 > 1, the universe is closed, and takes the shape of a spherical manifold.
- If Ω0 < 1, the universe is open, and takes the shape of a hyperbolic manifold.
- And if Ω0 = 1, the universe is flat.The image below shows the geometries of the three possible universes:
WMAP calculations show that at the present time, Ω0 = 1.02 ± 0.02. This shows that our universe is very close to the critical density of Ω = 1, the density at which our universe would be static and show no expansion.
So, locally, the geometry of the observable universe is flat. But, on a global scale, the universe as a whole is slightly closed, since the density parameter is so close to the critical density of one, but slightly larger. This very near flat, slightly closed geometry is what’s causing the universe to expand forever.
So, to answer your question, the universe that we know is basically flat.
Idunno who made this but I had this saved on my computer and basically, by looking at your hands you can tell what tribe you would be in if you would live in the bending world. Pretty sweet right? Personally I would be an airbender, I would just ride around on an air ball all day aww yish
Fiya powaaaaaa. Which is a little sad, because I really like the air kingdom.
i need this