This new NASA/ESA Hubble Space Telescope image shows ghostly green filaments, lying within galaxy NGC 5252. This filament was illuminated by a blast of radiation from a quasar — a very luminous and compact region that surrounds the supermassive black hole at the centre of its host galaxy. Its bright green hue is a result of ionised oxygen, which glows brightly at green wavelengths. Heic1507f

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