NASA / GODDARD SPACE FLIGHT CENTER / SCIENCE PHOTO LIBRARY NASA / GODDARD SPACE FLIGHT CENTER / SCIENCE PHOTO LIBRARY
Milky Way gamma-ray bubbles. Computer illustration of two newly-discovered (as of 2015) gamma ray bubbles (blue) extending north and south from the Milky Way's galactic centre. These features span 50,000 light years but their origin and nature are not fully understood. It is thought they may be the remnant of an eruption from a supersized black hole at the centre of the Milky Way. Image based on data obtained by the Large Area Telescope (LAT) onboard NASA's Fermi Gamma-ray Space Telescope (FGST).
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