Different colors are gamma rays of different energies. Red dots represent rays with highest energies. Blue dots are those with low energies. (Credit: NASA/DOE/Fermi LAT Collaboration)
The Fermi Gamma-Ray Space Telescope (FGST) witnessed the highest energy gamma-ray burst ever. It is calculated to be 12.2 billion light-years away.
Different colors are gamma rays of different energies. Red dots represent rays with highest energies. Blue dots are those with low energies. (Credit: NASA/DOE/Fermi LAT Collaboration)
Gamma rays are high-energy electromagnetic radiation. They emitted when nuclei change energy levels. Gamma-ray bursts are believed to occur from explosions of dying stars.
original article at ScienceDaily