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| Quasar 3C 273 |
Quasars are the most energetic objects in the sky, radiating the energy of 100,000 million Suns from compact regions not much bigger than our own solar system. They are explosions at the centres of giant galaxies, probably occurring in a ring of hot gases circling a very heavy black hole. They are also the most distant objects yet discovered, some lying about 15,000 million light years away!
