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added by globalquiz.org July 19, 2012, 6:26 p.m.
What are the most luminous objects in the universe?
supergiant stars
novae
supernovae
quasars
A quasar is an extremely energetic source of radiation powered by accretion disc around galaxy's central supermassive black hole. Quasars were much more common in the early universe, as all known quasars are extremely distant.
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+5 Very interesting!  globalquiz.org