The colliding galaxies would have created a powerful density wave that would have swept out the material into an expanding ring, stimulating star formation.
碰撞的两个星系产生了强烈的密度波，把物质推到外侧的环形上，并激发了恒星的形成。
Some proposals for problems involved in experimental technique were put forward through resin matrix composite freely expanding ring experimental technique analysis.
通过树脂基复合材料爆炸自由膨胀环实验的分析，对实验技术中存在的问题提出了一些建议。
The expanding ring carries with it another great mystery, however: why wasn't this supernova seen 400 years ago when light from the initial blast should have passed the Earth?
关于这个正在膨胀的圆环，还有一个不为人知的秘密——400年前，当这颗超新星开始爆发，为什么地球上没人注意到？
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