Hello all . I can not explain good but hope you will understand my purpose . I read in University Oregon's website that universe came from a pure energy in vacuum If we want to say exactly , we can say universe came from Potential energy in vacuum . We know in physics there are some conversation laws such as conversation of energy and conversation of angular and linear momentum and son on . And we know momentum is a quantity that can carry by objects and particles like electrons and photons and in generally any elementary particles . And we know in early universe there aren't any particles or objects just existed pure energy . And we know energy isn't physical object or particle . My first question is : 1 -Was there in early universe any momentum ? conversation of momentum says it should be existed ( like energy ) but this momentum carry by what (or which ) particles or objects ? My second question is : 2 - energy is thing or nothing ? why Stephen Hawking says universe came from nothing ? if we consider universe came from pure energy . My third question is : 3- why we can not say universe came from pure momentum ? why we must say universe came from pure energy ? I really confused . Thanks for your help .