Occurring when material from a companion star begins to build up on a white dwarf, for ten points, name these celestial explosions which are much less explosive than their super counterparts.
The most recent one to be visible to the naked eye occurred in 1975 in the constellation Cygnus. RS Ophiuchi has undergone at least four in the last century, and even non-recurrent ones can be used as standard candles. Occurring when material from a companion star begins to build up on a white dwarf, for ten points, name these celestial explosions which are much less explosive than their super counterparts.
The most recent one to be visible to the naked eye occurred in 1975 in the constellation Cygnus.
{Novae} (DNA: supernovae)