Hence it is considered that a galacticyear can be based on to institute an ideal geologic time scale in which a galacticyear 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。
2
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。
3
Two 30,000 light-year-long blobs called Fermi bubbles have been discovered on either side of our galactic plane. John Matson reports