context: Supernova means superb explosion of a star with greater energy than nova. Supernovae are extremely high in brightness and cause explosive radiation, so they shine with brightness comparable to an entire galaxy over weeks or months until dark. During this brief period, the supernova radiates as much radiation as the energy the sun is supposed to emit over its lifetime. [1] As a result of the explosion, the star vomits most or all of its constituents. [2] At this time, the speed is accelerated to 30,000 km / s (10% of the speed of light), causing a shock wave in the surrounding interstellar medium. [3] In the place where the shock wave was swept away, a shell of expanding gas and dust remained, and this is called supernova remnant.
question: What is a supernova?
answers.text: explosion of a star with greater energy than nova