Earth Orbit Extreme Change

So recently I got slated for missing some glaring obvious flaws in my story on here, which I really do appreciate. I'm approaching the question from a different angle though, in two parts.

What would be required to send the earth spinning both slower AND spinning out of orbit away from the sun? By slower, I mean earth rotations that take a 1000 or so years (give or take 500 yrs).

My very layman's thinking is that a mass large enough on the far side of Earth, passing close enough, may possible be strong enough to alter the planets trajectory without eviscerating all human life? Or as the sun dies is there a change in mass, perhaps the two combined? The mass could be pulled into some form of orbit of the new earth.

I do not need the universe to be preserved as-is, or long-term, but would like humans to still be alive even if in shelters underground until the sun is on the far side of the planet after a few hundred years.

I know this is a lot to ask, I'm reading all the other questions and will delete this is I find my answers there. I'm a psychologist by training so all this is way outside my field of knowledge xD. Thanks!

posted about 6 years ago

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