Illustration: Planet and moon cross in front of star.

插图：地球和月球在恒星前方交叉。

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Kipping hasn't put his method into practice yet, since no star is known to have both a planet and moon that transit. However, NASA's Kepler spacecraft should discover several such systems.

由于还没有发现任何恒星同时有行星和其卫星凌日，Kipping并没有把他的方法运用于实际。但是，NASA的开普勒号航空飞船会在将来发现一些这样的系统。

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A full moon can be a savior for reducing the required exposure time and allowing for extended depth of field, while a moonless night greatly increases star visibility.

满月可以帮你减少曝光时间、扩大景深，而月光暗淡的夜晚增加了星星的可见度。

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But in constructing the first atmospheric model that has the orbital dynamics of a star-planet-moon system fully included, astronomers Duncan Forgan, at the Royal Observatory in Edinburgh, and David Kipping, at the Harvard Smithsonian Center for Astrophysics in Cambridge, turn that idea on its head.

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Kepler-37b is a tad larger than our heavenly dance partner, the Moon, and whizzes round a star much like our Sun, with two larger planets in its system for company.

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