Croswell believes we should define a planet simply - as something that goes around the sun and has the diameter of Pluto or more.

克罗斯维尔认为，我们对行星的定义应当简化，即行星是一种周期性围绕太阳旋转的星体，其直径不应小于冥王星的直径。

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Two researchers (separated by the Atlantic ocean, rather than the English Channel), have used gravitational perturbations that affect comets, rather than planets, to predict the existence of something that might be a planet, or might be a star depending mainly on how you define a planet or a star.

ECONOMIST: X marks the spot

Celebrity Planet has launched a Will and Kate Royal Wedding Walk featuring "landmarks that helped define the next Royal golden couple", as the company's website puts it.

BBC: Going to London for the royal wedding