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| | Three's Company: Asteroid 87 Sylvia and her two moons: Science News Online, Aug. 13, 2005 (Site not responding. Last check: 2007-11-06) |
 | | Marchis and his colleagues became interested in 87 Sylvia, one of the largest rocks in the asteroid belt between Mars and Jupiter, after another team announced in 2001 that it had discovered a single moon circling the asteroid. |
 | | The orbits of both moons, along with the size of 87 Sylvia, reveal that the large asteroid has an average density less than half that of solid rock, the team calculates. |
 | | Discovered in 1866, 87 Sylvia is named after Rhea Sylvia, the mythical mother of the founders of Rome. |
| www.sciencenews.org /articles/20050813/fob5.asp (607 words) |
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