Fischer et al. recently posted an article about the existence of the first quintuple-planet system, they write:
"Thus, 55 Cnc is the first quintuple-planet system known."
The methods to discover exo-planets are improving. Maybe soon Astrobiology practitioners will find the first life signal outside Earth.
They also write:
"Thus, 55 Cnc system has some basic structural attributes found in our solar system: nearly coplanar, circular orbits, with a dominant gas giant between 5-6 AU. This similarity suggests that such solar system architectures are not extremely rare."
SETI seems more prescient with these new data.
Nevertheless as Guillermo Gonzalez, from Iowa State, writes:
"The planets are too massive to be habitable. It is an interesting system, though, given the low eccentricities of the planets' orbits."
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