| The companion star of this system is a white dwarf roughly the size of the earth. |
| The composition of the stars does not fit into any currently known class of white dwarf stars, so their evolution remains a mystery. |
| The collapsed core will become a white dwarf, composed of degenerate matter supported by the inability of two electrons to occupy the same space. |
| Among all the binary stars comprising a white dwarf, Sirius is a singular system. |
| If the clump is really there, it may come from nuclear burning inside the exploding white dwarf, or it may come from the companion star. |
| When its fuel runs out, an old star expands into a red giant and then collapses to become a white dwarf. |
