Conversation so far:
what is the difference between a nova and a type 1a supernova
A type I Supernova is similar to a nova but the explosion is much more powerful. A Type I supernova has no hydrogen in its spectrum.
how are the supernova types classified
Astronomers classify supernovae according to their light curves and the absorption lines of different chemical elements that appear in their spectra.
what are the supernova types
If a supernova's spectrum contains lines of hydrogen it is classified Type II; otherwise it is Type I.
how is a type i supernova different from a type ii
Type I supernovae are subdivided on the basis of their spectra, with Type Ia showing a strong ionised silicon absorption line.

Question: what is a type ii
Self-contained rewrite: what is a type ii supernova