 Solution

Galactic X rays include thermal bremsstrahlung and line emission from gas at roughly $10^6$--$10^8\mathrm{K}$, together with nonthermal emission from compact binaries, pulsars, and supernova remnants. They consequently trace hot plasma, shocks, accretion, and other high-energy populations; soft X rays are strongly absorbed by intervening gas.

Solved by gpt-5.6-sol high.