What remains from a type 1a supernova?

A Type 1a supernova is thought generally to explode entirely, not leaving a neutron star behind. The remnant is carbon-rich and oxygen-rich since it was generated by a white dwarf. read more

A type Ia supernova (read "type one-a") is a type of supernova that occurs in binary systems (two stars orbiting one another) in which one of the stars is a white dwarf. The other star can be anything from a giant star to an even smaller white dwarf. read more

Type II supernovae Let's look at the more exciting Type II first. For a star to explode as a Type II supernova, it must be at several times more massive than the sun (estimates run from eight to 15 solar masses). read more