...These temporary stars, which appear spontaneously to the observers onthe Earth, and quickly vanish again, are doubtless due to collisions,conflagrations, or celestial cataclysms... 
Camille Flammarion Frances A. Welby 「Astronomy for Amateurs」
...In thecase of collisions the chances are against the bodies striking togethercentrally, it being very much more likely that they will hit each otherrather towards the side...
Cecil G. Dolmage 「Astronomy of To-day」
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