Hence it is considered that a galactic year can be based on to institute an ideal geologic time scale in which a galactic year is an era.
银河年是建立理想地质年代表的基础，每一个银河年就是一个代。
In an interview last year with The Economist, George Whitesides, chief executive of space-tourism firm Virgin Galactic, was placing his company in the latter category.
在去年接受《经济学人》采访时，太空旅游公司维珍银河的首席执行官乔治·怀特赛兹将他的公司归为后一类。
Two 30,000 light-year-long blobs called Fermi bubbles have been discovered on either side of our galactic plane. John Matson reports
在银河盘面两端，发现了两个长达30,000光年的东东，它们被称作费米尔泡。
Last year, astronomers took a major step to chart dark matter, with a map of the substance around individual galaxies and galactic clusters.
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.
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。
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