Here's why:

* Nuclear Fusion: The Sun's core is where nuclear fusion takes place. This process involves hydrogen nuclei (protons) fusing together to form helium nuclei.

* Energy Release: During fusion, a tremendous amount of energy is released in the form of gamma rays, along with neutrinos and kinetic energy.

* Absorption and Re-emission: The gamma photons produced in the core don't immediately escape the Sun. They are absorbed and re-emitted by the dense plasma in the core, a process that takes millions of years.

* Energy Transport: Eventually, the energy from these gamma photons is transported outward through the Sun's radiative zone and then the convective zone, finally reaching the surface as visible light and other forms of electromagnetic radiation.

So, while gamma photons are initially created in the core, their journey to the surface involves a long and complex process of absorption, re-emission, and energy transport.