Hubble Space Telescope Visible-Light Data of Kepler's Supernova Remnant
Supernovae are extremely luminous and cause a burst of radiation that often briefly outshines an entire galaxy, before fading from view over several weeks or months. During this short interval a supernova can radiate as much energy as the Sun is expected to emit over its entire life span.
Credit:
NASA, ESA, R. Sankrit and W. Blair (Johns Hopkins University)