question: “do you think that with these adoptions that take place over time, that people will be one day be able to walk on the sun and not get burned?”
The short answer is simply no, we will not be able to walk on the sun and not get burned.
I presume by "adoption" that you really meant "adaption." I don't know if the error is yours or is actually a quote from your friend. But that still isn't the appropriate word. I adapt to weather conditions - i.e., I become accustomed to them. The correct word is "adaptation." Adaptations are changes in structure, function, or behavior by which a species or individual improves its chance of survival in a specific environment. Adaptations develop as the result of natural selection operating on random genetic variations.
Since the ability to walk on the sun (even if we imagine that it were actually possible) offers no reproductive advantage to any species or individual, there is no selective pressure for such an ability to develop.