Apparently there are planets orbiting binary star systems.  In the past we’ve found single planets orbiting two stars, but it was thought that more than one planet would see the gravitational forces throwing them either into the stars, out of the system, or into each other.  Kepler-47, in the constellation of Cygnus, has two planets – and one of them is in the habitable zone, where liquid water can exist.

It’s probably a gas giant, but Prof William Welsh, from San Diego State University, said:

“Kepler-47c is not likely to harbour life, but if it had large moons, those would be very interesting worlds.”

Now I’m wondering what a day would be like on one of those moons.  Imagine, you are on a moon, orbiting a planet, orbiting two suns.  What would you see and experience as the day progressed?  Obviously you can’t answer that properly without knowing the lengths of the orbits involved.  My astrophysics is not good enough to figure it out even knowing the orbits.

On the other hand, is it important?  How many books have you read in which the protagonist noticed what phase the moon was in?  (Apart from books about werewolves, they don’t count!)  Unless the fact that there are two suns is central to the plot, why should it matter?  The occasional comment about the suns rising or the planet setting, and that should be enough.

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