Science, Space and Technology News 2024
Looking like glittering jewels, the stars in this Hubble Space Telescope image at left are part of the ancient globular star cluster NGC 6397. Scattered among these brilliant stars are extremely faint stars. Hubble’s Advanced Camera for Surveys has taken a census of the cluster stars, uncovering the faintest stars ever seen in a globular cluster. Globular clusters are spherical concentrations of hundreds of thousands of old stars. Credit: NASA, ESA and H.
The vast majority of white dwarfs are formed after a dying star has expelled its outer layers to form a, leaving behind an approximately Earth-sized inner core that is the white dwarf. Other white dwarfs in binary systems may explode as novae but then not go on to form a White dwarfs no longer support nuclear fusion reactions that generate energy, but they are still extremely hot. They cool over time, and it is predicted that they would ultimately form ‘black dwarfs’, although the Universe is likely not old enough for any black dwarfs to exist yet.
The luminosity of white dwarfs can therefore be used by astronomers to measure how long ago star formation began in a particular region. By providing important ‘fossil’ records of the stars that they formed from, white dwarfs are an important cosmological tool. A white dwarf is the stellar core left behind after a dying star has exhausted its nuclear fuel and expelled its outer layers to form a planetary nebula. Credit: ESA/Hubble,, which astronomers reported as the dimmest stars ever seen in a globular star cluster. Hubble’s Advanced Camera for Surveys completed a census of two distinct stellar populations in one cluster, known as NGC 6397, and surveyed the faintest dwarf stars.
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