The oldest and coldest known white dwarf — an Earth-sized remnant of a sun-like star that has died — could be the first known white dwarf with multiple dust rings. The discovery forces researchers to reconsider models of planetary systems.
The oldest and coldest known white dwarf — an Earth-sized remnant of a sun-like star that has died — could be the first known white dwarf with multiple dust rings. The discovery forces researchers to reconsider models of planetary systems.