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WordReference Random House Learner's Dictionary of American English © 2024su•per•no•va /ˌsupɚˈnoʊvə/USA pronunciation n. [countable], pl. -vas, -vae /-vi/USA pronunciation . - Astronomya nova millions of times brighter than the sun.
See -nov-. WordReference Random House Unabridged Dictionary of American English © 2024su•per•no•va (so̅o̅′pər nō′və),USA pronunciation n., pl. -vas, -vae (-vē).USA pronunciation [Astron.]- Astronomythe explosion of a star, possibly caused by gravitational collapse, during which the star's luminosity increases by as much as 20 magnitudes and most of the star's mass is blown away at very high velocity, sometimes leaving behind an extremely dense core.
- Astronomythe star undergoing such an explosion. Cf. supernova remnant, black hole, neutron star, nova.
Collins Concise English Dictionary © HarperCollins Publishers:: supernova /ˌsuːpəˈnəʊvə/ n ( pl -vae / -viː/, -vas)- a star that explodes catastrophically owing to either instabilities following the exhaustion of its nuclear fuel or gravitational collapse following the accretion of matter from an orbiting companion star, becoming for a few days up to one hundred million times brighter than the sun. The expanding shell of debris (the supernova remnant) creates a nebula that radiates radio waves, X-rays, and light, for hundreds or thousands of years
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