Fraser CainAstronomers have found some unusual planetary systems, including planets that orbit around two stars. These are circumbinary planets, and it takes special conditions to be stable. Even if the planets can remain in orbit around both stars, what about their moons? Astronomers haven't found any exomoons yet, but a new paper explores the conditions under which they could form and survive. This is exciting because many would be in the habitable zone of the binary stars.
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