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Message: <blockquote data-quote="Desdichado" data-source="post: 2334007" data-attributes="member: 2205">I assume you mean brown dwarf, but yeah, as JimAde says, we need more info.  Typically, a brown dwarf will have a diameter somewhere in the vicinity of Jupiter, but much more mass.  This higher mass means that there will be considerable heat radiation from contraction -- the brown dwarf may glow dully like an ember.To have the planet/moon not be tidally locked is perhaps a bit tricky, unless it's fairly far away, unless there's some mysterious force that keeps it from being so.  Can't imagine what that would be.  Keep in mind that there are other hazards too -- Jupiter's large satellites are smack-dab in the middle of an extremely "hot" magnetic field belt and are bathed in radiation almost constantly, making the possibility of life meager at best.  To shield it, it would need it's own powerful magnetic field, and the close interaction between them will tend to have their magnetic fields twisted and disrupted.  And tidal forces bend the moons something fierce; Io, for instance, is pulled and stretched like a ball of taffy by Jupiter's tidal forces.But assuming you can get around those obstacles, I think the idea of an earth-like satellite of a giant planet or brown dwarf is a nifty idea and always have.  I've also been stymied by the details of it's orbit around its host as well as its host's orbit around the star and what that means in terms of seasons, climate, day and night and a number of other things, though.  If someone better in the know than I pops in, I'm extremely interested in that idea too.</blockquote>

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