天文学家发现一颗系外行星，它的主恒星起源于银河系外，而且此恒星的金属含量明显少于模型预期中的同类主恒星。
An exoplanet has been discovered orbiting a star of extragalactic origin that contains far less metal than models predict for stars with planets. Christopher Intagliata reports.
Hooper和Linden认为，就是这些粒子与银河系磁场的相互作用产生了辐射薄雾。他们已经建立了他们预计的辐射轮廓的模型。
Hooper and Linden believe that these particles interact with the galaxy's magnetic field to produce a haze of radiation - and have modelled what they expect this radiation profile to look like.
要把银河系的转速转换成质量，天文学家要依靠模型，而这模型能显示暗物质在星系中是怎样被影响的。
To convert measurements of the Milky Way's rotation speed to mass, astronomers must rely on models of how dark matter is distributed in the galaxy.
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