One with official designation 2003fg reached two solar masses before exploding, and was given the nickname "Champagne."
Iron-56 dominates the spectra of absorption lines for one class of these phenomena, which are caused by white dwarves exceeding the Chandrasekhar limit. An inert nickel-iron core in a star leads to one on account of a lack of degeneracy pressure. One with official designation 2003fg reached two solar masses before exploding, and was given the nickname "Champagne." For 10 points, name these gigantic stellar explosions.
Iron-56 dominates the spectra of absorption lines for one class of these phenomena, which are caused by white dwarves exceeding the Chandrasekhar limit.
{supernovae} [or {supernovas;} prompt on {stellar collapse;} do not accept or prompt on \"nova\"]