The probable progenitors of Type 1a supernovae, these objects remain at the
The probable progenitors of Type 1a supernovae, these objects remain at the centers of planetary nebulae after the outer layers of a star are dispersed.  Nearby examples include Procyon B and Sirius B, both about the size of the Earth and mass of the Sun.  What class of stellar objects, for ten points, will our Sun likely join in 5 billion years.
The probable progenitors of Type 1a supernovae, these objects remain at the centers of planetary nebulae after the outer layers of a star are dispersed.  
white dwarfs