After 18 years of observations and 650 individual doppler measurements at Lick and Keck observatories, we are reporting the discovery of the first quintuple planet system. The star 55 Rho Cancri, already known to host four extrasolar planets, also has a Saturn-mass planet in the habitable zone, where water can exist in liquid form.
More Information
These links provide more information on this new discovery:
NASA Press Release. with Extensive Graphics. The California & Carnegie Planet Search page on 55 Rho Cancri is another useful resource. Moreover, the following link will take you to the published Discovery Paper: "Five Planets Orbiting 55 Cancri" ,accepted for publication in the Astrophysical Journal. Finally, check out the Google News Results on Rho Cancri.
