re: The awakening of the fault that caused the NYC earthquake is the beginning of the end.

quote:

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The Sun isn’t expected to go supernova (it would need to be something like 10x larger). Also, the collision of the Milky Way and Andromeda galaxies is not as big of a deal as it sounds like. There’s a lot of space between stars in a galaxy.

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This. The sun is predicted to fuse all of its hydrogen and begin fusing heavier elements in a few billion years, which will cause it to swell into a red giant.

Still not great for earth as it will incinerate the inner planets, but it will be gradual unlike a supernova.

And yes, the only thing that might happen when the galaxies combine is a new stage of increased star formation as dust clouds and nebula combine.