去年，天文学家开始着手为暗物质绘图，地图上包括个体星系和银河系群星周围的物质。
Last year, astronomers took a major step to chart dark matter, with a map of the substance around individual galaxies and galactic clusters.
假如太阳系处于一个体积大得多、星系又密集的星系团里，太阳系就可能不会像现在这么稳定了。
Our solar system likely would not be so stable if it were located in a much larger, dense cluster of galaxies.
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