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| | Tau Ceti |
 | | There also may be an optical companion star seen in telescopes that is not actually bound by gravity to Tau Ceti, and the star does not appear to have a dim stellar or substellar companion based on astrometric measurements (Lippincott and Worth, 1980) or radial velocity variations (Campbell et al, 1988). |
 | | Given Tau Ceti's estimated age of 10 billion years, the estimated mass of its dust disk fits its expected decline with time compared to the disk mass of the younger nearby star Epsilon Eridani, which may only be 500 million to one billion years old. |
 | | Modelling of Tau Ceti's dust disk observations by the astronomers indicate, however, that the mass of the colliding bodies up to 10 kilometers (6.2 miles) in size may total around 1.2 Earth-masses, compared with 0.1 Earth-masses estimated to be in the Solar System's Edgeworth-Kuiper Belt (Greaves et al, 2004). |
| www.solstation.com /stars/tau-ceti.htm (1019 words) |
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