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Message: <blockquote data-quote="The Grumpy Celt" data-source="post: 3581542" data-attributes="member: 1019">Well, I don’t want to thread-hijack here – I was just chiming in. The planet in question will be orbiting B, which is yellow-orange in color rather than yellow-white. I thought this made an interesting aesthetic choice.My understanding is the illumination provided by the other star, at night, at its brightest will be about that of an electric street light. But this will vary depending on the position of the inhabited planet as determined by rotation and revolution.The larger planet may be a larger rocky body or as small a gas planet as they come, I’ve not made up my mind. The inhabited planet is smaller than Earth, but is more dense so as to have about 85 to 90 percent Earth gravity.I’m aiming for hard science fiction, but it will have fantasy elements – basically a scientist will pop up and be able to explain some things, but will be clueless about others. In part, the planet was apparently terraformed by aliens 6,000 years ago (with a Pliocene epoch biosphere – what can I say, I like mammoths), and then the aliens put people on it about 1,000 years ago. And no one (except the now absent aliens) knows why or how.But back to you…I think it is interesting your doing this, paying attention to this level of detail. So few fantasy writer/DM/Whatnot bother with that kind of foundation or background. Given that it is a titan/tree and composed of islands rather than a rocky body, the planet cannot have a functional magnetosphere; i.e without a flowing, liquid metallic core it could not generate the magnetic current needed to inhibit solar radiation to levels tolerable by life as we know it. I take the titan/tree deals with the solar radiation.How do the individual islands retain water? Unless they are bowl shaped, then water will flow out of them as it runs down hill.  I think the longer and more unusually day-night cycles are more interesting but they are more distinct from that of Earth and the familiar. Is there is a special calendar or system for measuring time in the setting?</blockquote>

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