the.com/white dwarf
a dead star wearing its own ashes, cooling for trillions of years with nowhere left to burn.
means a white dwarf is the collapsed, earth-sized core left behind when a sun-like star runs out of fuel and sheds its outer layers.
from first spotted in 1862 when astronomers noticed sirius wobbling, tugged by an invisible companion; that companion, sirius b, turned out to be absurdly dense and faint white, giving the class its name.
densitya teaspoon would weigh about a ton
support systemheld up by electron pressure, not fusion
fatecools for longer than the universe has existed
upper limitchandrasekhar mass caps it at 1.4 suns