# Question 99a10

Oct 9, 2016

E = mC² and m = E/(C²)

#### Explanation:

The mass-energy equation is Einstein's famous equation:

E = mC²

where $C$ is the speed of light and $m$ is the amount of mass converted into energy $E$. This equation, also, works in reverse:

m = E/(C²)#

This equation is far more significant, because it describes the process by which all of the original matter (mostly hydrogen and helium) of the universe came into existence at the beginning of time.