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Comment Re:I think we have other things to worry about (Score 1) 51

Whether Earth will be swallowed is hotly debated (no pun intended). It's on the borderline of swallow-vs-non-swallow such that every new bit of research seems to shift the boundary back and forth across the threshold.

A key variable is how much mass the sun will lose before it swells to Earth's orbit. Surface instability typically spits off chunks of the expiring star such that it loses mass. Mass loss will move the orbits of the planets outward, giving Earth more margin, but how much mass is lost is not well understood yet. It depends on the the star's size, rotation, and composition, which is unique for every star, and formulas that factor all 3 of these are only rough drafts.

Earth will at least be BBQ'd.

Comment Re:Misleading header, eventually WILL collide (Score 1) 51

Okay, thanks, but the outskirts of galaxies are quite sparse of "regular" matter, and thus friction would be very little relative to the mass of the galaxy. Friction from ordinary matter could slow the bodies a tiny bit if they pass mostly adjacent, but not by much.

Dark matter is believed to somehow cause friction based on some things I've read (don't have link yet), and it hangs out at the outskirts of galaxies, where early passes typically occur. Thus, I'm referring to what might be called "non-baryonic friction".

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