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A white dwarf is a stellar core remnant composed mostly of electron-degenerate matter. A white dwarf is very dense: its mass is comparable to the Sun 's, while its volume is comparable to Earth 's. A white dwarf's low luminosity comes from the emission of residual thermal energy; no fusion takes place in a white dwarf. [1]
6 sept. 2021 · White dwarfs are the compact, dense and hot remnants of stars that have stopped nuclear fusion. Hubble observations reveal that some white dwarfs can burn hydrogen on their surfaces, slowing down their cooling and challenging the age estimates of star clusters.
25 avr. 2023 · White dwarfs are the hot, dense cores of dead stars that mark the final stage of evolution for most stars, including our sun. Learn how they are born, what they are made of, and how they can explode or fade away in this astronomy essentials article.
12 mars 2024 · White dwarfs are stars that have burned up all of the hydrogen they once used as nuclear fuel. Fusion in a star's core produces heat and outward pressure, but this...
Learn about the fascinating properties and evolution of white dwarfs, the final stage of most stars in the universe, from NASA experts.
2 févr. 2023 · Astronomers used Hubble to observe how a background star was deflected by the gravity of a nearby white dwarf, LAWD 37, in 2019. This technique, called gravitational microlensing, allowed them to determine the white dwarf's mass as 56 percent of the Sun's mass.
14 juin 2024 · Learn about the definition, size, mass, life cycles, and facts of white dwarf stars, the dense and compact remnants of intermediate- and low-mass stars. Find out how they are supported by degeneracy pressure, have a limiting mass, and cool down over time.
