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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.
In 2013 Hubble found signs of Earth-like planets in the atmospheres of a pair of white dwarf stars roughly 150 light-years away and only 625 million years old. Hubble's spectroscopic observations identified silicon in the atmospheres of the two white dwarfs, a major ingredient of the rocky material that forms Earth and other terrestrial planets in the Solar System.
One white dwarf binary, which orbits once every 12.75 minutes, will be potentially the “brightest” gravitational wave source for LISA. Space-Warping White Dwarfs Produce Gravitational Waves. Using NASA’s Chandra X-ray Observatory and other telescopes to find X-ray sources created by neutron stars in binary systems with ordinary stars.
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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.
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.
