The universe's density refers to how much of this matter is packed into a given volume of space.
If the universe's density is great enough for its gravity to overcome the force of expansion, then the universe will curl into a ball.
This is known as the closed model, with positive curvature resembling a sphere..
A cosmological model, or simply cosmology, provides a description of the largest-scale structures and dynamics of the universe and allows study of fundamental questions about its origin, structure, evolution, and ultimate fate..
The Lambda-CDM, Lambda cold dark matter or ΛCDM model is a mathematical model of the Big Bang theory with three major components: a cosmological constant denoted by lambda (Λ) associated with dark energy, the postulated cold dark matter, and. ordinary matter..
The ΛCDM model has been shown to satisfy the cosmological principle, which is just physics talk for saying that the universe looks the same regardless of where you are.
However, recent findings have suggested that violations of the cosmological principle, especially of isotropy, exist..
