STEPHAN'S LAW

Where E is the energy radiated away in the form of E-M radiation, T is the surface temperature and is a constant called the Stephan-Boltzmann constant.

• This means that if you double the temperature of an object, it will radiate times as much energy per square cm and in total if it's surface area doesn't change.
• Now lets think about the Sun and Ori.

  So, something funny is going on. The Sun has a higher surface temperature so it must radiate more energy per unit surface area. There is only one way that Ori could radiate more total energy - it must have a larger total surface area.

• How much larger is Ori?

  for the Sun is larger than that of Ori by:

  

• If the two stars had the same radius and surface area, the Sun would radiate 6.8 times as much energy. But Ori has a total energy radiated that is 27,000 times more than that of the Sun.