But observations across the spectrum suggest that light at all wavelengths came from a single region located far away roughly five light-years from the black hole, which is greater than the distance between our sun and the nearest star. Gamma rays, the highest-energy form of light, were thought to be produced closest in. When they arrived in April, NASA's Fermi Gamma-ray Space Telescope caught the outburst, which helped two ground-based gamma-ray observatories detect some of the highest-energy light ever seen from a galaxy so distant.Īstronomers had assumed that light at different energies came from regions at different distances from the black hole. Watch this video on the NASA Goddard YouTube channel.Ī long time ago in a galaxy half the universe away, a flood of high-energy gamma rays began its journey to Earth.

PKS_1441_still_1_thm.png (80x40) Įxplore how gamma-ray telescopes in space and on Earth captured an outburst of high-energy light from PKS 1441+25, a black-hole-powered galaxy more than halfway across the universe.Ĭredit: NASA's Goddard Space Flight Center

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