Answer:
The scale is same at both planets.
Step-by-step explanation:
The scale of nuclear fusion reaction on earth is the same as compared to fusion reactions that is happening in the sun because both reactions produces the same product i. e. energy and heat etc and both are occurring naturally. Due to large size of the sun, huge number of nuclear fusion reactions occur ac compared to the earth which is smaller in size so the scale of both nuclear fusion reactions are the same but vary in numbers.