[SPACE] Co-orbital Habitable Planets

[Terwin]

Originally Posted by Anthony

It's the only coherent explanation I've seen for the 'red planet' and Pern.

I always figured that The red planet was one of:
A) pluto-like orbit that leaves a trail of spores behind while crossing the orbital path of Pern (where as Pern fills the Neptune role of that pair)
B) the 'Red Planet' is actually a large comet with spores on it that grow/disperse when it is close to the sun(possibly fed by passing through a methane/ethane rich section of the oort cloud)

I prefer B because I think the spores show up for ~ 1 year every ~50 years, so a comet that seeds the orbit of Pern with spores that fall as Thread until the orbital path is clear again. Perhaps a planet sized 'comet' but still in a comet-like orbit