Alkuräjähdysnu

Alkuräjähdysnu refers to the Finnish term for the Big Bang, the prevailing cosmological model for the observable universe from the earliest known periods through its subsequent large-scale evolution. The model describes how the universe expanded from an initial state of high density and temperature. This expansion is ongoing, and all of space itself is expanding. The earliest physical conditions have been accurately described by the Big Bang model's parameters and equations. Key evidence supporting the Big Bang theory includes the observed expansion of the universe, the abundance of light elements, and the cosmic microwave background radiation. The theory was first proposed by Georges Lemaître in 1927 and later developed by others, including Edwin Hubble, whose observations of galactic redshift provided strong empirical support. The term "alkuräjähdys" translates directly to "beginning explosion," conveying the idea of a singular, energetic origin event. While the exact initial conditions remain a subject of ongoing research and theoretical exploration, the Big Bang model has been remarkably successful in explaining a wide range of cosmological observations and continues to be the cornerstone of modern cosmology.