Learn how to say Supernovae correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word supernovae:
(plural) -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 Compare nova