supernova


su·per·no·va

noun \ˌsü-pər-ˈnō-və\

astronomy : the explosion of a star that causes the star to become extremely bright

Full Definition of SUPERNOVA

1
:  the explosion of a star in which the star may reach a maximum intrinsic luminosity one billion times that of the sun
2
:  one that explodes into prominence or popularity; also :  superstar

Examples of SUPERNOVA

  1. <tragically, a shoulder injury cut short the pitching career of one of baseball's brightest supernovas>

Origin of SUPERNOVA

New Latin
First Known Use: 1926

Rhymes with SUPERNOVA

supernova

noun    (Concise Encyclopedia)

Any of a class of violently exploding stars whose luminosity after eruption suddenly increases many millions of times above its normal level. Like novas, supernovas undergo a tremendous, rapid brightening lasting a few weeks, followed by a slow dimming, and show blue-shifted emission lines on spectroscopy, which implies that hot gases are blown outward. Unlike a nova, a supernova explosion is a catastrophic event for a star, leading to its collapse into a neutron star or black hole. Amounts of its matter equal to the mass of several Suns may be blasted into space with such energy that the exploding star outshines its entire home galaxy. Only seven supernovas are known to have been recorded before the 17th century, the most famous in AD 1054; its remnants are visible today as the Crab Nebula. The closest and most studied supernova in modern times is SN 1987A, which appeared in 1987 in the Large Magellanic Cloud. Supernova explosions release not only tremendous amounts of radio energy and X-rays but also cosmic rays; in addition, they create and fling into interstellar space many of the heavier elements found in the universe, including those forming Earth's solar system.

Browse

Next Word in the Dictionary: supernumerary (adjective)
Previous Word in the Dictionary: supernormal
All Words Near: supernova

Seen & Heard

What made you want to look up supernova? Please tell us where you read or heard it (including the quote, if possible).

Get Our Free Apps
Voice Search, Favorites,
Word of the Day, and More
Join Us on FB & Twitter
Get the Word of the Day and More