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Q&A Effect of impact of a pure gas comet?

I'm not even sure if gas comets can exist naturally -- feel free to comment on that in the answers. But assume that somehow a large block of frozen hydrogen/helium/oxygen/nitrogen is tumbling throu...

4 answers  ·  posted 8y ago by SRM‭  ·  last activity 7y ago by SRM‭

Question space astronomy earth gas