Supernovas

A supernova (abbreviated SN, plural SNe after "supernovae") is a stellar explosion that is more energetic than a nova. It is pronounced /ˌsuːpəˈnoʊvə/ with the plural supernovae/ˌsuːpəˈnoʊviː/ or supernovas. Supernovae are extremely luminous and cause a burst ofradiation that often briefly outshines an entire galaxy, before fading from view over several weeks or months. During this interval a supernova can radiate as much energy as the Sun is expected to emit over its entire life span.^[1] The explosion expels much or all of a star's material^[2] at a velocity of up to 30,000 km/s (10% of the speed of light), driving a shock wave^[3] into the surrounding interstellar medium. This shock wave sweeps up an expanding shell of gas and dust called a supernova remnant.

Gaby Huitrón