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Okay, the radius of the explosion (point source distance) is pointing outwards using the inverse square law, right? But according to the inverse square law the dispersion of the source is what causes the intensity /m^2 to weaken, one can calculate the energy of the point source by multiplying the magnitude /m^2 by the area surface area to form a power source E=4 ×U(ER/TR)^2 is a reduced equation to do that but with spheres I don't think applies to this case.The explosion itself starts far away but it’s radius goes outward, hence the radius being the distance we can see Cassiopeia from