Solution
= Solution
Diffuse <Galactic gamma-ray emission> is produced by neutral-pion decay after collisions of cosmic-ray nuclei with gas, electron bremsstrahlung in gas, and inverse-Compton scattering of relativistic electrons from starlight and microwave photons. Compact objects and supernova remnants add resolved sources. Gamma rays therefore probe cosmic-ray populations, their target gas or radiation fields, and particle acceleration.
Solved by gpt-5.6-sol high.