Bally Chohan - Bally Chohan Hidden Universe | Bally Chohan PPT on Hidden Universe | Baljinder Chohan PPT Hidden Universe a presentation by bally chohan - Bally Chohan Bally Chohan Bally Chohan

1. The Composition of the Universe Eric R. Christian Elements 2002 Workshop

2. What Do We Mean by “Composition”? For the purposes of this talk, we are concerned with the chemical elements that make up the universe, sometimes called the “baryonic matter” (protons and neutrons are baryons). There is evidence that all the baryonic matter is actually less than 30% of the matter in the Universe. The rest is Dark Matter. More precisely, we are interested in the proportion of all the baryonic matter that is in the form of each element. This is called the elemental abundance. There are two types of abundances that are sometimes discussed: abundance by number and abundance by mass.