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.
from All Top News -- ScienceDaily https://www.sciencedaily.com/releases/2019/02/190219132736.htm
from All Top News -- ScienceDaily https://www.sciencedaily.com/releases/2019/02/190219132736.htm
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