This method can be applied to terrain correction point by point for the airborne gamma energy spectrum in cases of any flight ways and arbitrary topographic conditions.

It would seem sensible to seek the source of these in the universe's most conspicuous energy factories: quasars and gamma-ray bursts billions of light-years away from Earth.

If the black hole eats a star every 30,000 years, that hot plasma could provide enough energy to power the gamma-ray bubbles.