Changes

==Old Universe View==

==Old Universe View==

In the cosmological model of a billions of years old universe, it is theorized that the metallicity of certain astronomical objects may offer clues to those objects' ages. According to their [[Big Bang|Big Bang theory]], when the universe first formed, it consisted mostly of hydrogen with a sizable proportion of helium; only trace amounts of [[lithium]] and [[beryllium]] are believed to have been created, with no heavier elements forming. In this model, older stars will have lower metallicity than younger stars, as all other elements were created through stellar and supernova nucleosynthesis.   

In the cosmological model of a billions of years old universe, it is theorized that the metallicity of certain astronomical objects may offer clues to those objects' ages. According to their [[Big Bang|Big Bang theory]], when the universe first formed, it consisted mostly of hydrogen with a sizable proportion of helium; only trace amounts of [[lithium]] and [[beryllium]] are believed to have been created, with no heavier elements forming. In this model, older stars will have lower metallicity than younger stars, as all other elements were created through stellar and supernova nucleosynthesis.  In this model, stars classified as population III stars are the oldest known stars, followed by population II stars, and finally population I stars, which are the youngest.

[[Category:Astronomy]]

[[Category:Astronomy]]