A new study of the ever-present fog of gamma rays from sources outside our galaxy shows that less than a third of the emission arises from what astronomers once considered the most likely suspects - black-hole-powered jets from active galaxies.
Top stargazer marco Ajello, an astrophysicist at the Kavli Institute for Particle Astrophysics and Cosmology (KIPAC)said that this leaves a lot of room for new scientifict theories.
Or put another way “we have not got a clue what we are looking at so we need to make something better up”
According to the conventional explanation, the background glow of gamma rays represents the accumulated emission of a vast number of active galaxies that are simply too faint and too distant to be seen.
According to the Astrophysical Journal, which we get for the spot the Pulsar competition, Fermi has shown that this is not the case.
Ackermann's own theory is that particle acceleration occurring in normal star-forming galaxies is a strong contender for the large amounts of Gamma radiation.
Then of course, there is the idea that it might be all dark matter which is what scientists say when they have not got a clue.
We are pumping for the following explanation. That the gamma rays on the edges of the galaxy are being made by giant space dragons burping after a liquid lunch.