supernova
n. countable C1 Advanced US //ˌsupɝˈnoʊvə// UK //sˈuːpənˈəʊvɐ// su·per·no·va
n. a massive star that explodes at the end of its life. This explosion is incredibly bright and can briefly shine more than an entire galaxy.
n. the cataclysmic explosion of a massive star, resulting in a sudden and immense increase in luminosity. Occurs when a star exhausts its nuclear fuel and collapses under its own gravity.
The telescope captured a clear image of the supernova.
Astronomers observed a distant supernova that appeared as a bright new point of light in the night sky.
The heavy elements necessary for life were forged in the intense heat of a supernova and scattered across the universe by the resulting shockwave.
From super- + nova.
Usage
The plural form can be either 'supernovas' or 'supernovae'.