A star that suddenly increases greatly in brightness because of a catastrophic explosion that ejects most of its mass.
- ‘The picture provides evidence that supernovae are one source of cosmic rays, highly energetic particles that bombard the planet, passing through us in their thousands every day.’
- ‘The research and analysis ranges from providing more accurate hurricane predictions, to climate change, galaxy formation, black holes and supernovas.’
- ‘An international team of astronomers has identified the surviving companion star to the 1572 supernova explosion witnessed by the Danish astronomer Tycho Brahe.’
- ‘I read up on interstellar objects and astrophysics and studied quasars, pulsars and supernovas, but my main focus was black holes.’
- ‘They discover comets, asteroids, quasars, pulsars, supernovae, planets orbiting other stars, and galaxies at the edge of the universe, but none have ever claimed to have discovered a UFO.’
We take a look at several popular, though confusing, punctuation marks.