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A white dwarf produces no new heat of its own, so it gradually cools over billions of years. Despite the name, white dwarfs can emit visible light that ranges from blue white to red. Scientists sometimes find that white dwarfs are surrounded by dusty disks of material, debris, and even planets – leftovers from the original star’s red giant phase.
19 de oct. de 2023 · The estimated life span of a white dwarf is 5 billion years or more and during this time, it cools off. White dwarfs are believed to have a surface temperature of less than 10,000 Kelvin and, if that’s the case, a planet as close as 0.005 to 0.02 AU (Astronomical Unit) could potentially be habitable for life to develop.
23 de sept. de 2021 · An Artist's conception of the evolution of our Sun (left) through the red giant stage (center) and onto a white dwarf (right). A typical white dwarf is half as massive as the Sun, yet only slightly bigger than Earth. An Earth-sized white dwarf has a density of 1 x 10 9 kg/m 3 . Earth itself has an average density of only 5.4 x 10 3 kg/m 3.
White dwarf stars and the Chandrasekhar limit （页面存档备份，存于互联网档案馆）, Dave Gentile, Master's thesis, 帝博大學, 1995. Estimating Stellar Parameters from Energy Equipartition （ 页面存档备份 ，存于 互联网档案馆 ）, sciencebits.com. Discusses how to find mass-radius relations and mass limits for white dwarfs using simple energy arguments.
4 de dic. de 2007 · Details. NASA’s Hubble Space Telescope is providing strong evidence that white dwarfs, the burned-out relics of stars, are given a “kick” when they form. The sharp vision of Hubble’s Advanced Camera for Surveys uncovered the speedy white dwarfs in the ancient globular star cluster NGC 6397, a dense swarm of hundreds of thousands of stars.
10 de jul. de 2023 · White Dwarf has been a part of Warhammer since the very beginning*, and during that time it has taken many forms. With Issue 490 of this illustrious publication, the team are revealing their latest creation, and perhaps one of the most significant changes to the magazine ever.
Amendment 25: New Opportunity: C.27 Lucy in the L4 Trojans Participating Scientist Program.
