Part of the difficulty is that we can only observe exoplanets indirectly, inferring their existence by the way they affect the stars they orbit.

困难之一是没法直接观测到系外行星，只能通过它们对其所环绕的恒星所施加的影响来推测其存在。

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Thespacecraft is also probing the interiors of stars by studying starquakes ontheir surfaces—in much the same way that geologists learn about the Earth'sinterior by studying earthquakes.

与此同时，该卫星还通过研究恒星表面发生的星震来探测其内部情况，正如地质学家研究地震来了解地球的内部构造。

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Side by side: the billions of stars of the Milky Way and the Northern Lights appear to fall like rain over mountains and a moody lake.

肩并肩：银河系的亿万颗星星、下雨般落到山上的极光，以及变化多端的湖面。伊莱·亚森先生等待数日拍下来的美景。

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By their calculations, most of the Milky Way's stars 100 billion is the most conservative estimate have one or more planets, the researchers reported Wednesday in Nature.

WSJ: Galaxy Hosts 100 Billion Planets, in New Estimate

One way in which the independents have kept costs low is by grooming inexpensive new talent instead of signing up established stars.

ECONOMIST: Hollywood's fading charms

Even though one of the walls of the Madison Avenue store is hung with photographs of famous perfumers he's worked with the same way a restaurant or deli might display 8-by-10 autographed glossies of movie stars he counts only one man who actually possessed a supernatural sense of smell.

WSJ: On the Scent of Luxury With an Upper East Side Perfumer