Assumptions of homogeneity, isotropy lead to expanding or contracting models. Einstein introduces cosmological constant to allow static universe. With GR and homogeneity and isotropy and no cosmological constant, there are 3 possible universes . All evolve with time. All but the lightest elements can be made in stars .
Most cosmologists agree that the universe is evolving.
Abundances of He, D support standard model. Particle physics and cosmology interact. Simulations of early universe require cold dark matter. Huge structures are found. Cosmologists eagerly await MAP and Planck for definitive measurements.