A circumstellar disk of dust orbiting a relatively mature star. Also known as a debris disk. Regenerated disks have been found around a number of young main sequence stars, including Beta Pictoris, Fomalhaut, Vega, and BD +31° 643. The dust in these disks may have come from a variety of sources, including the collisional grinding of asteroids and of ice objects in an unseen Kuiper Belt, and the ejection of dust from star-grazing comets. Such material forms a tenuous disk around our own Sun, known as the zodiacal cloud.
Related category STELLAR ASTROPHYSICS
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