| Among all the binary stars comprising a white dwarf, Sirius is a singular system. |
| The collapsed core will become a white dwarf, composed of degenerate matter supported by the inability of two electrons to occupy the same space. |
| These explosions are called novae, and the white dwarf star will brighten significantly as seen from the Earth. |
| The companion star of this system is a white dwarf roughly the size of the earth. |
| But quantum theory said that there is a way to make a star denser than a white dwarf. |
| The planet, more than twice the size of Jupiter, orbits two stars, a pulsar and a white dwarf that linked together about a billion years ago. |
