This artist’s concept shows the entire sky in gamma rays with magenta circles illustrating the uncertainty in the direction from which more high-energy
Attribution-Share Alike 2.0 Generic license. Attribution: Two dark green cabinets, Graig Park Circle, Newport by Jaggery You are free: to share – to copy, distribute
Alike 2.0 Generic license. Attribution: Sunkenkirk Stone Circle from Knott Moor by Perry Dark You are free: to share – to copy, distribute and transmit