Supernovae
Noun
Examples
A few percent of the Type Ic supernovae are associated with gamma-ray bursts (GRB), though it is also believed that any hydrogen-stripped Type Ib or Ic supernova could produce a GRB, depending on the geometry of the explosion.
Adding the prefix "super-" distinguishes supernovae from ordinary novae, which are far less luminous.
As such, they say that the research casts doubt on the very existence of dark energy, because the major evidence pointing to its existence relies on these supernovae all having a predictable brightness.
Ancient astronomical records of phenomena like supernovae and comets are sometimes used in modern astronomical studies.
Because of this, astronomers used several Cepheid variables in NGC 4639 to calibrate type 1a supernovae as standard candles for more distant galaxies.
Although the energy that disrupts each type of supernovae is delivered promptly, the light curves are mostly dominated by subsequent radioactive heating of the rapidly expanding ejecta.