There are gamma-ray detectors that can determine direction: > The LAT detects gamma rays by using Einstein’s famous E = mc2 equation in a technique known as pa

There are gamma-ray detectors that can determine direction: > The LAT detects gamma rays by using Einstein’s famous E = mc2 equation in a technique known as pair production. When a gamma ray, which is pure energy, slams into a layer of tungsten in the detector, it can create a pair of subatomic particles (an electron and its antimatter counterpart, a positron). The direction of the incoming gamma ray is determined by projecting the direction of these particles back to their source using several layers of high-precision silicon tracking detectors. https://fermi.gsfc.nasa.gov/ https://fermi.gsfc.nasa.gov/ https://www.nasa.gov/pdf/221503main_GLAST-041508.pdf https://www.nasa.gov/pdf/221503main_GLAST-041508.pdf