Briefly explain debris disks
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Infrared astronomers have found cold, low-density dust disks around older stars such as Vega and Beta Pictoris. Although much younger than the Sun, these stars are on the main sequence and have completed their formation, so they are clearly in a later stage than the newborn stars in Orion. These low-density disks generally have even lower-density inner zones where planets may have formed. Such tenuous dust disks are sometimes called debris disks because they are understood to be dusty debris released in collisions among small bodies such as comets, asteroids, and Kuiper Belt objects.
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